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The core code from pth has been taken out and included in gstreamer.

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Original commit message from CVS:
The core code from pth has been taken out and included in gstreamer.
This code is documented, more or less, in http://www-124.ibm.com/pthreads/docs/rse-pmt.ps.

This code is designed to replace cothreads.[ch], eventually.
This commit is contained in:
Andy Wingo 2002-01-21 00:20:29 +00:00
parent debf06d4b9
commit 1bc541f213
19 changed files with 5309 additions and 0 deletions
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____ _ _
| _ \| |_| |__
| |_) | __| '_ \ ``Some people have entirely too
| __/| |_| | | | much free time on their hands.''
|_| \__|_| |_| -- Gene Spafford
GNU Pth - The GNU Portable Threads
AUTHORS
=======
This is a list of authors who have written
or edited major parts of the GNU Pth sources.
o GNU Pth (as a whole):
Written by: Ralf S. Engelschall
Edited by: Ralf S. Engelschall
o pthread.pod:
Written by: Ralf S. Engelschall
Parts from: The Open Group
Edited by: Ralf S. Engelschall
Modified for inclusion in GStreamer by Andy Wingo <wingo@pobox.com>
All bugs to gstreamer-devel@lists.sourceforge.net

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This package has been modified for use with GStreamer. Go to the root gstreamer
directory to install.

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##
## NGPT - Next Generation Threading
## Copyright (c) 2001 IBM Corporation <babt@us.ibm.com>
## Portions Copyright (c) 1999-2000 Ralf S. Engelschall <rse@engelschall.com>
##
## This file is part of NGPT, a non-preemptive thread scheduling
## library which can be found at http://www.ibm.com/developer
##
## This library is free software; you can redistribute it and/or
## modify it under the terms of the GNU Lesser General Public
## License as published by the Free Software Foundation; either
## version 2.1 of the License, or (at your option) any later version.
##
## This library is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## Lesser General Public License for more details.
##
## You should have received a copy of the GNU Lesser General Public
## License along with this library; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
## USA.
##
## Makefile.am: NGPT Makefile.in hacked into an automake file by wingo
## <wingo@pobox.com>
##
# ``UNIX -- where you can do anything
# in two keystrokes, or less...''
noinst_LTLIBRARIES = libpth-mctx.la
libpth_mctx_la_SOURCES = pth_mctx.c pth_p.h pth_vers.c pth.h pth_acdef.h pth_acmac.h
noinst_PROGRAMS = test-pth
test_pth_LDADD = libpth-mctx.la
#pth_mctx_a_DEPENDENCIES = shtool
BUILT_SOURCES = pth_p.h
HSRCS = $(srcdir)/pth_debug.c $(srcdir)/pth_errno.c $(srcdir)/pth_mctx.c
# build the private shared header file
pth_p.h: $(srcdir)/pth_p.h.in $(HSRCS)
$(srcdir)/shtool scpp -o pth_p.h -t $(srcdir)/pth_p.h.in -Dcpp -Cintern -M '==#==' $(HSRCS)
#shtool:
# shtoolize -o shtool scpp

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no gnus here

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I ripped the core out of GNU pth to provide cothreading for GStreamer. That's
what this package is. It was written by Ralf Engelschall. Plaudits to him, bug
reports to gstreamer-devel@lists.sourceforge.net.
wingo <wingo@pobox.com>, 20 Jan 2002

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/*
** GNU Pth - The GNU Portable Threads
** Copyright (c) 1999-2001 Ralf S. Engelschall <rse@engelschall.com>
**
** This file is part of GNU Pth, a non-preemptive thread scheduling
** library which can be found at http://www.gnu.org/software/pth/.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
** USA, or contact Ralf S. Engelschall <rse@engelschall.com>.
**
** pth_acdef.h Autoconf defines
*/
#ifndef _PTH_ACDEF_H_
#define _PTH_ACDEF_H_
@TOP@
/* the custom Autoconf defines */
#undef HAVE_SIG_ATOMIC_T
#undef HAVE_PID_T
#undef HAVE_STACK_T
#undef HAVE_SIZE_T
#undef HAVE_SSIZE_T
#undef HAVE_SOCKLEN_T
#undef HAVE_NFDS_T
#undef HAVE_OFF_T
#undef HAVE_GETTIMEOFDAY_ARGS1
#undef HAVE_STRUCT_TIMESPEC
#undef HAVE_SYS_READ
#undef HAVE_POLLIN
#undef HAVE_SS_SP
#undef HAVE_SS_BASE
#undef HAVE_LONGLONG
#undef HAVE_LONGDOUBLE
#undef PTH_DEBUG
#undef PTH_NSIG
#undef PTH_MCTX_MTH_use
#undef PTH_MCTX_DSP_use
#undef PTH_MCTX_STK_use
#undef PTH_STACKGROWTH
#undef PTH_DMALLOC
@BOTTOM@
#endif /* _PTH_ACDEF_H_ */

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dnl ##
dnl ## NGPT - Next Generation POSIX Threading
dnl ## Copyright (c) 2001 IBM Corporation <babt@us.ibm.com>
dnl ## Portions Copyright (c) 1999-2000 Ralf S. Engelschall <rse@engelschall.com>
dnl ##
dnl ## This file is part of BlueThreads, a non-preemptive thread scheduling
dnl ## library which can be found at http://www.ibm.com/developer
dnl ##
dnl ## This library is free software; you can redistribute it and/or
dnl ## modify it under the terms of the GNU Lesser General Public
dnl ## License as published by the Free Software Foundation; either
dnl ## version 2.1 of the License, or (at your option) any later version.
dnl ##
dnl ## This library is distributed in the hope that it will be useful,
dnl ## but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
dnl ## Lesser General Public License for more details.
dnl ##
dnl ## You should have received a copy of the GNU Lesser General Public
dnl ## License along with this library; if not, write to the Free Software
dnl ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
dnl ## USA.
dnl ##
dnl ## configure.in: ngpt Autoconf specification
dnl ##
dnl # hacked on for inclusion into the gstreamer project 20 Jan 2002 by Andy
dnl # Wingo <wingo@pobox.com>
dnl # ``Programming in Bourne-Shell
dnl # is a higher form of masochism.''
dnl # -- Unknown
AC_INIT
AM_CONFIG_HEADER(pth_acdef.h)
AM_INIT_AUTOMAKE(pth, 1400)
AC_MSG_PART(Build Tools)
AC_PROG_CC
AC_PROG_CPP
AC_SET_MAKE
AM_PROG_LIBTOOL
dnl ## Support for some special platform/compiler options
case "$PLATFORM:$CC" in
*-sun-solaris2*:cc )
# shut-up harmless warnings caused by do-while macros on Solaris
test ".$ac_cv_prog_gcc" = ".no" && PTH_CFLAGS="$PTH_CFLAGS -w"
;;
*-*-sysv*uw[27]*:cc )
# shut-up harmless warnings caused by do-while macros on UnixWare
PTH_CFLAGS="$PTH_CFLAGS -w"
;;
*-hp-hpux*:cc )
# HPUX needs a few special options to find its ANSI C brain
PTH_CFLAGS="$PTH_CFLAGS -Ae -O"
;;
*-hp-hpux*:CC )
# HPUX outputs useless warnings
PTH_CFLAGS="$PTH_CFLAGS -w"
;;
*-sgi-irix6.2:cc )
# shut-up warnings caused by IRIX brain-dead 32/64 bit stuff
PTH_LDFLAGS="$PTH_LDFLAGS -woff 85 -Wl,-woff,84 -Wl,-woff,85"
;;
*-sgi-irix6.5.[2-9]:cc )
# since IRIX 6.5.2 the C compiler is smart enough,
# but the linker is still complaining, of course
PTH_LDFLAGS="$PTH_LDFLAGS -woff 84,85,134"
;;
*-sgi-irix6.5:cc )
# shut-up warnings caused by IRIX brain-dead 32/64 bit stuff
PTH_CFLAGS="$PTH_CFLAGS -woff 1110,1048"
PTH_LDFLAGS="$PTH_LDFLAGS -woff 84,85,134"
;;
*-dec-osf4*:cc )
# make sure the standard compliant functions are used on Tru64/OSF1 4.x
PTH_CFLAGS="$PTH_CFLAGS -std"
;;
*-dec-osf5*:cc )
# make sure the standard compliant functions are used on Tru64/OSF1 5.x
PTH_CFLAGS="$PTH_CFLAGS -std -D_XOPEN_SOURCE_EXTENDED"
;;
*-*-isc*:* )
# ISC is brain-dead and needs a bunch of options to find its brain
PTH_CPPFLAGS="$PTH_CPPFLAGS -D_POSIX_SOURCE";
PTH_LIBS="$PTH_LIBS -lcposix -linet";
;;
esac
AC_MSG_PART(Mandatory Platform Environment)
dnl # check for standard headers
AC_HEADER_STDC
AC_HAVE_HEADERS(dnl
stdio.h stdlib.h stdarg.h string.h signal.h unistd.h setjmp.h fcntl.h dnl
errno.h sys/types.h sys/time.h sys/wait.h sys/socket.h sys/socketcall.h)
AC_CHECK_FUNCTIONS(dnl
gettimeofday select sigaction sigprocmask sigpending sigsuspend)
AC_BEGIN_DECISION([mandatory system headers and functions])
AC_IFALLYES(dnl
header:stdio.h header:stdlib.h header:stdarg.h header:string.h dnl
header:signal.h header:unistd.h header:setjmp.h header:fcntl.h header:errno.h dnl
header:sys/types.h header:sys/time.h header:sys/wait.h header:sys/socket.h dnl
func:gettimeofday func:select func:sigaction func:sigprocmask dnl
func:sigpending func:sigsuspend,
AC_DECIDE(fine, [all fine]))
AC_END_DECISION
AC_MSG_PART(Optional Platform Environment)
dnl # check for the number of signals
dnl AC_CHECK_NSIG(PTH_NSIG)
dnl # check whether poll(2)'s input stuff has to be faked
AC_CHECK_FUNCTIONS(poll)
AC_CHECK_DEFINE(POLLIN, poll.h)
AC_MSG_CHECKING(whether poll(2) facility has to be faked)
AC_IFALLYES(func:poll define:POLLIN, PTH_FAKE_POLL=0, PTH_FAKE_POLL=1)
if test .$PTH_FAKE_POLL = .1; then
msg="yes"
else
msg="no"
fi
AC_SUBST(PTH_FAKE_POLL)
AC_MSG_RESULT([$msg])
dnl # check for readv/writev environment
AC_HAVE_HEADERS(sys/uio.h)
AC_CHECK_FUNCTIONS(readv writev)
AC_MSG_CHECKING(whether readv(2)/writev(2) facility has to be faked)
AC_IFALLYES(func:readv func:writev header:sys/uio.h, PTH_FAKE_RWV=0, PTH_FAKE_RWV=1)
if test .$PTH_FAKE_RWV = .1; then
msg="yes"
else
msg="no"
fi
AC_SUBST(PTH_FAKE_RWV)
AC_MSG_RESULT([$msg])
dnl # check for various other functions which would be nice to have
AC_CHECK_FUNCTIONS(usleep strerror)
dnl # check for various other headers which we might need
AC_HAVE_HEADERS(sys/resource.h net/errno.h)
dnl # check whether we've to use a non-standard #include <sys/select.h> to get
dnl # the definition for fd_set under AIX and other brain-dead platforms.
AC_HAVE_HEADERS(sys/select.h)
EXTRA_INCLUDE_SYS_SELECT_H="#include <sys/select.h>"
if test ".$ac_cv_header_sys_select_h" != .yes; then
EXTRA_INCLUDE_SYS_SELECT_H="/* $EXTRA_INCLUDE_SYS_SELECT_H */"
fi
AC_SUBST(EXTRA_INCLUDE_SYS_SELECT_H)
dnl # check whether we've to define sig_atomic_t
AC_CHECK_TYPEDEF(sig_atomic_t, signal.h)
FALLBACK_SIG_ATOMIC_T="typedef int sig_atomic_t;"
if test ".$ac_cv_typedef_sig_atomic_t" = .yes; then
FALLBACK_SIG_ATOMIC_T="/* $FALLBACK_SIG_ATOMIC_T */"
fi
AC_SUBST(FALLBACK_SIG_ATOMIC_T)
dnl # check whether we've to define pid_t
AC_CHECK_TYPEDEF(pid_t, sys/types.h)
FALLBACK_PID_T="typedef int pid_t;"
if test ".$ac_cv_typedef_pid_t" = .yes; then
FALLBACK_PID_T="/* $FALLBACK_PID_T */"
fi
AC_SUBST(FALLBACK_PID_T)
dnl # check whether we've to define size_t
AC_CHECK_TYPEDEF(size_t, stdlib.h)
FALLBACK_SIZE_T="typedef unsigned int size_t;"
if test ".$ac_cv_typedef_size_t" = .yes; then
FALLBACK_SIZE_T="/* $FALLBACK_SIZE_T */"
fi
AC_SUBST(FALLBACK_SIZE_T)
dnl # check whether we've to define ssize_t
AC_CHECK_TYPEDEF(ssize_t, sys/types.h)
FALLBACK_SSIZE_T="typedef unsigned int ssize_t;"
if test ".$ac_cv_typedef_ssize_t" = .yes; then
FALLBACK_SSIZE_T="/* $FALLBACK_SSIZE_T */"
fi
AC_SUBST(FALLBACK_SSIZE_T)
dnl # check whether we've to define off_t
AC_CHECK_TYPEDEF(off_t, sys/types.h)
FALLBACK_OFF_T="typedef int off_t;"
if test ".$ac_cv_typedef_off_t" = .yes; then
FALLBACK_OFF_T="/* $FALLBACK_OFF_T */"
fi
AC_SUBST(FALLBACK_OFF_T)
dnl # check whether stack_t exists instead of sigaltstack
AC_CHECK_TYPEDEF(stack_t, signal.h)
dnl # check whether ss_base instead of ss_sp attribute exists
AC_CHECK_STRUCTATTR(ss_base, sigaltstack, sys/signal.h)
AC_CHECK_STRUCTATTR(ss_sp, sigaltstack, sys/signal.h)
dnl # check for gettimeofday() variant
AC_MSG_CHECKING(for a single-argument based gettimeofday)
cross_compile=no
AC_TRY_COMPILE([
#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
],[
struct timeval tv;
(void)gettimeofday(&tv);
],
msg="yes"
,
msg="no"
)
case $PLATFORM in
*-*-mvs* ) msg="no" ;; # on OS/390 the compiler test doesn't work
*-*-aix4* ) msg="no" ;; # on AIX the compiler test doesn't work
*-*-isc* ) msg="no" ;; # on ISC the compiler test doesn't work
esac
if test ".$msg" = .yes; then
AC_DEFINE(HAVE_GETTIMEOFDAY_ARGS1)
fi
AC_MSG_RESULT([$msg])
dnl # check for struct timespec
AC_MSG_CHECKING(for struct timespec)
cross_compile=no
AC_TRY_COMPILE([
#include <time.h>
#include <sys/time.h>
],[
struct timespec ts;
],
msg="yes"
,
msg="no"
)
if test ".$msg" = .yes; then
AC_DEFINE(HAVE_STRUCT_TIMESPEC)
fi
AC_MSG_RESULT([$msg])
dnl ##
dnl ## MACHINE CONTEXT IMPLEMENTATION
dnl ##
AC_MSG_PART(Machine Context Implementation)
dnl #
dnl # 1. determine possibilities
dnl #
dnl # check for MCSC method
AC_CHECK_HEADERS(ucontext.h)
AC_CHECK_FUNCTIONS(makecontext swapcontext getcontext setcontext)
AC_CHECK_MCSC(mcsc=yes, mcsc=no)
dnl # check for SJLJ method
AC_CHECK_HEADERS(signal.h)
AC_CHECK_FUNCTIONS(sigsetjmp siglongjmp setjmp longjmp _setjmp _longjmp)
AC_CHECK_FUNCTIONS(sigaltstack sigstack)
AC_CHECK_SJLJ(sjlj=yes, sjlj=no, sjlj_type)
dnl #
dnl # 2. make a general decision
dnl #
if test ".$mcsc" = .yes; then
mctx_mth=mcsc
mctx_dsp=sc
mctx_stk=mc
elif test ".$sjlj" = .yes; then
mctx_mth=sjlj
mctx_dsp=$sjlj_type
mctx_stk=none
AC_IFALLYES(func:sigstack, mctx_stk=ss)
AC_IFALLYES(func:sigaltstack, mctx_stk=sas)
case $mctx_dsp in
sjljlx|sjljisc|sjljw32 ) mctx_stk=none
esac
else
AC_ERROR([no appropriate mctx method found])
fi
dnl #
dnl # 3. allow decision to be overridden by user
dnl #
AC_ARG_WITH(mctx-mth,dnl
[ --with-mctx-mth=ID force mctx method (mcsc,sjlj)],[
case $withval in
mcsc|sjlj ) mctx_mth=$withval ;;
* ) AC_ERROR([invalid mctx method -- allowed: mcsc,sjlj]) ;;
esac
])dnl
AC_ARG_WITH(mctx-dsp,dnl
[ --with-mctx-dsp=ID force mctx dispatching (sc,ssjlj,sjlj,usjlj,sjlje,...)],[
case $withval in
sc|ssjlj|sjlj|usjlj|sjlje|sjljlx|sjljisc|sjljw32 ) mctx_dsp=$withval ;;
* ) AC_ERROR([invalid mctx dispatching -- allowed: sc,ssjlj,sjlj,usjlj,sjlje,sjljlx,sjljisc,sjljw32]) ;;
esac
])dnl
AC_ARG_WITH(mctx-stk,dnl
[ --with-mctx-stk=ID force mctx stack setup (mc,ss,sas,...)],[
case $withval in
mc|ss|sas|none ) mctx_stk=$withval ;;
* ) AC_ERROR([invalid mctx stack setup -- allowed: mc,ss,sas,none]) ;;
esac
])dnl
dnl #
dnl # 4. determine a few additional details
dnl #
dnl # whether sigaltstack has to use stack_t instead of struct sigaltstack
AC_CHECK_TYPEDEF(stack_t, signal.h)
dnl # ibm - test whether we need a separate register stack (IA64).
AC_CHECK_NEED_FOR_SEPARATE_STACK(PTH_NEED_SEPARATE_REGISTER_STACK)
dnl # ibm - end
dnl # direction of stack grow
AC_CHECK_STACKGROWTH(PTH_STACKGROWTH)
if test ".$ac_cv_check_stackgrowth" = ".down"; then
PTH_STACK_GROWTH="down"
else
PTH_STACK_GROWTH="up"
fi
AC_SUBST(PTH_STACK_GROWTH)
dnl # how to specify stacks for the various functions
AC_CHECK_STACKSETUP(makecontext, pth_skaddr_makecontext, pth_sksize_makecontext)
AC_CHECK_STACKSETUP(sigaltstack, pth_skaddr_sigaltstack, pth_sksize_sigaltstack)
AC_CHECK_STACKSETUP(sigstack, pth_skaddr_sigstack, pth_sksize_sigstack)
dnl # how to implement POSIX compliant sig{set,long}jmp()
case $mctx_dsp in [
ssjlj )
pth_sigjmpbuf='sigjmp_buf'
pth_sigsetjmp='sigsetjmp(buf,1)'
pth_siglongjmp='siglongjmp(buf,val)'
;;
sjlj )
pth_sigjmpbuf='jmp_buf'
pth_sigsetjmp='setjmp(buf)'
pth_siglongjmp='longjmp(buf,val)'
;;
usjlj )
pth_sigjmpbuf='jmp_buf'
pth_sigsetjmp='_setjmp(buf)'
pth_siglongjmp='_longjmp(buf,val)'
;;
sjlje )
pth_sigjmpbuf='jmp_buf'
pth_sigsetjmp='setjmp(buf)'
pth_siglongjmp='longjmp(buf,val)'
;;
sjljlx|sjljisc|sjljw32 )
pth_sigjmpbuf='sigjmp_buf'
pth_sigsetjmp='sigsetjmp(buf,1)'
pth_siglongjmp='siglongjmp(buf,val)'
;;
] esac
pth_sigjmpbuf="#define pth_sigjmpbuf $pth_sigjmpbuf"
pth_sigsetjmp="#define pth_sigsetjmp(buf) $pth_sigsetjmp"
pth_siglongjmp="#define pth_siglongjmp(buf,val) $pth_siglongjmp"
AC_SUBST(pth_sigjmpbuf)
AC_SUBST(pth_sigsetjmp)
AC_SUBST(pth_siglongjmp)
dnl #
dnl # 5. export the results
dnl #
AC_DEFINE_UNQUOTED(PTH_MCTX_MTH_use, [PTH_MCTX_MTH_$mctx_mth])
AC_DEFINE_UNQUOTED(PTH_MCTX_DSP_use, [PTH_MCTX_DSP_$mctx_dsp])
AC_DEFINE_UNQUOTED(PTH_MCTX_STK_use, [PTH_MCTX_STK_$mctx_stk])
PTH_MCTX_ID="$mctx_mth/$mctx_dsp/$mctx_stk"
AC_MSG_RESULT([decision on mctx implementation... ${TB}${PTH_MCTX_ID}${TN}])
AC_SUBST(PTH_MCTX_ID)
AC_MSG_VERBOSE([decided mctx method: $mctx_mth])
AC_MSG_VERBOSE([decided mctx dispatching: $mctx_dsp])
AC_MSG_VERBOSE([decided mctx stack setup: $mctx_stk])
dnl ## Additional support for some special platform/compiler options
case "$PLATFORM:$CC" in
*-ibm-mvs*:cc | *-ibm-mvs*:c++ )
mvs_extras='-W "c,float(ieee)" -W "c,langlvl(extended)" -W "c,expo,dll"'
PTH_CFLAGS="$PTH_CFLAGS $mvs_extras"
mvs_extras='-W "l,p,map" -W "l,map,list"'
PTH_LDFLAGS="$PTH_LDFLAGS $mvs_extras"
;;
esac
AC_MSG_PART(Output Substitution)
AC_OUTPUT(
Makefile
pth.h
pth_acmac.h
)

74
gst/cothreads/pth.h.in Normal file
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/*
** GNU Pth - The GNU Portable Threads
** Copyright (c) 1999-2001 Ralf S. Engelschall <rse@engelschall.com>
**
** This file is part of GNU Pth, a non-preemptive thread scheduling
** library which can be found at http://www.gnu.org/software/pth/.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
** USA, or contact Ralf S. Engelschall <rse@engelschall.com>.
**
** pth.h: Pth public API definitions
*/
/* ``What you see is all you get.''
-- Brian Kernighan */
/* hacked, needs updated docs - wingo <wingo@pobox.com> */
#ifndef _PTH_H_
#define _PTH_H_
/* the library version */
#ifndef PTH_VERSION_STR
#define PTH_VERSION_STR "@PTH_VERSION_STR@"
#endif
#ifndef PTH_VERSION_HEX
#define PTH_VERSION_HEX @PTH_VERSION_HEX@
#endif
#ifndef PTH_VERSION
#define PTH_VERSION PTH_VERSION_HEX
#endif
/* essential headers */
#include <sys/types.h> /* for ssize_t, off_t */
#include <sys/signal.h> /* for sigset_t */
@EXTRA_INCLUDE_SYS_SELECT_H@
/* essential values */
#ifndef FALSE
#define FALSE (0)
#endif
#ifndef TRUE
#define TRUE (!FALSE)
#endif
#ifndef NUL
#define NUL '\0'
#endif
#ifndef NULL
#define NULL (void *)0
#endif
/* bitmask generation */
#define _BIT(n) (1<<(n))
/* C++ support */
#ifdef __cplusplus
#define BEGIN_DECLARATION extern "C" {
#define END_DECLARATION }
#else
#define BEGIN_DECLARATION /*nop*/
#define END_DECLARATION /*nop*/
#endif
#endif /* _PTH_H_ */

64
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/*
** GNU Pth - The GNU Portable Threads
** Copyright (c) 1999-2001 Ralf S. Engelschall <rse@engelschall.com>
**
** This file is part of GNU Pth, a non-preemptive thread scheduling
** library which can be found at http://www.gnu.org/software/pth/.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
** USA, or contact Ralf S. Engelschall <rse@engelschall.com>.
**
** pth_acmac.h: Autoconf macros
*/
#ifndef _PTH_ACMAC_H_
#define _PTH_ACMAC_H_
/* sig{set,long}jmp macros */
@pth_sigjmpbuf@
@pth_sigsetjmp@
@pth_siglongjmp@
/* stack setup macros */
#define pth_skaddr(func,skaddr,sksize) pth_skaddr_##func(skaddr,sksize)
#define pth_sksize(func,skaddr,sksize) pth_sksize_##func(skaddr,sksize)
@pth_skaddr_sigstack@
@pth_sksize_sigstack@
@pth_skaddr_sigaltstack@
@pth_sksize_sigaltstack@
@pth_skaddr_makecontext@
@pth_sksize_makecontext@
/* mctx compile defines */
#define PTH_MCTX_MTH(which) (PTH_MCTX_MTH_use == (PTH_MCTX_MTH_##which))
#define PTH_MCTX_DSP(which) (PTH_MCTX_DSP_use == (PTH_MCTX_DSP_##which))
#define PTH_MCTX_STK(which) (PTH_MCTX_STK_use == (PTH_MCTX_STK_##which))
#define PTH_MCTX_MTH_mcsc 1
#define PTH_MCTX_MTH_sjlj 2
#define PTH_MCTX_DSP_sc 1
#define PTH_MCTX_DSP_ssjlj 2
#define PTH_MCTX_DSP_sjlj 3
#define PTH_MCTX_DSP_usjlj 4
#define PTH_MCTX_DSP_sjlje 5
#define PTH_MCTX_DSP_sjljlx 6
#define PTH_MCTX_DSP_sjljisc 7
#define PTH_MCTX_DSP_sjljw32 8
#define PTH_MCTX_STK_mc 1
#define PTH_MCTX_STK_ss 2
#define PTH_MCTX_STK_sas 3
#define PTH_MCTX_STK_none 4
#endif /* _PTH_ACMAC_H_ */

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/*
** GNU Pth - The GNU Portable Threads
** Copyright (c) 1999-2001 Ralf S. Engelschall <rse@engelschall.com>
**
** This file is part of GNU Pth, a non-preemptive thread scheduling
** library which can be found at http://www.gnu.org/software/pth/.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
** USA, or contact Ralf S. Engelschall <rse@engelschall.com>.
**
** pth_debug.c: Pth debugging support
*/
/* ``MY HACK: This universe.
Just one little problem:
core keeps dumping.''
-- Unknown */
#include "pth_p.h"
#if cpp
#ifndef PTH_DEBUG
#define pth_debug1(a1) /* NOP */
#define pth_debug2(a1, a2) /* NOP */
#define pth_debug3(a1, a2, a3) /* NOP */
#define pth_debug4(a1, a2, a3, a4) /* NOP */
#define pth_debug5(a1, a2, a3, a4, a5) /* NOP */
#define pth_debug6(a1, a2, a3, a4, a5, a6) /* NOP */
#else
#define pth_debug1(a1) pth_debug(__FILE__, __LINE__, 1, a1)
#define pth_debug2(a1, a2) pth_debug(__FILE__, __LINE__, 2, a1, a2)
#define pth_debug3(a1, a2, a3) pth_debug(__FILE__, __LINE__, 3, a1, a2, a3)
#define pth_debug4(a1, a2, a3, a4) pth_debug(__FILE__, __LINE__, 4, a1, a2, a3, a4)
#define pth_debug5(a1, a2, a3, a4, a5) pth_debug(__FILE__, __LINE__, 5, a1, a2, a3, a4, a5)
#define pth_debug6(a1, a2, a3, a4, a5, a6) pth_debug(__FILE__, __LINE__, 6, a1, a2, a3, a4, a5, a6)
#endif /* PTH_DEBUG */
#endif /* cpp */
intern void pth_debug(const char *file, int line, int argc, const char *fmt, ...)
{
va_list ap;
static char str[1024];
size_t n;
errno_shield {
va_start(ap, fmt);
if (file != NULL)
snprintf(str, sizeof(str), "%d:%s:%04d: ", (int)getpid(), file, line);
else
str[0] = NUL;
n = strlen(str);
if (argc == 1)
strncpy (str+n, fmt, sizeof(str)-n);
else
vsnprintf(str+n, sizeof(str)-n, fmt, ap);
va_end(ap);
n = strlen(str);
str[n++] = '\n';
write(STDERR_FILENO, str, n);
}
return;
}

56
gst/cothreads/pth_errno.c Normal file
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@ -0,0 +1,56 @@
/*
** GNU Pth - The GNU Portable Threads
** Copyright (c) 1999-2001 Ralf S. Engelschall <rse@engelschall.com>
**
** This file is part of GNU Pth, a non-preemptive thread scheduling
** library which can be found at http://www.gnu.org/software/pth/.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
** USA, or contact Ralf S. Engelschall <rse@engelschall.com>.
**
** pth_errno.c: Pth errno support
*/
/* Steinbach's Guideline for Systems Programming:
``Never test for an error condition
you don't know how to handle.'' */
#include "pth_p.h"
#if cpp
/* enclose errno in a block */
#define errno_shield \
for ( pth_errno_storage = errno, \
pth_errno_flag = TRUE; \
pth_errno_flag; \
errno = pth_errno_storage, \
pth_errno_flag = FALSE )
/* return plus setting an errno value */
#if defined(PTH_DEBUG)
#define return_errno(return_val,errno_val) \
do { errno = (errno_val); \
pth_debug4("return 0x%lx with errno %d(\"%s\")", \
(unsigned long)(return_val), (errno), strerror((errno))); \
return (return_val); } while (0)
#else
#define return_errno(return_val,errno_val) \
do { errno = (errno_val); return (return_val); } while (0)
#endif
#endif /* cpp */
intern int pth_errno_storage = 0;
intern int pth_errno_flag = 0;

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/*
** GNU Pth - The GNU Portable Threads
** Copyright (c) 1999-2001 Ralf S. Engelschall <rse@engelschall.com>
**
** This file is part of GNU Pth, a non-preemptive thread scheduling
** library which can be found at http://www.gnu.org/software/pth/.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
** USA, or contact Ralf S. Engelschall <rse@engelschall.com>.
**
** pth_mctx.c: Pth machine context handling
*/
/* ``If you can't do it in
ANSI C, it isn't worth doing.''
-- Unknown */
#include "pth_p.h"
#if cpp
/*
* machine context state structure
*
* In `jb' the CPU registers, the program counter, the stack
* pointer and (usually) the signals mask is stored. When the
* signal mask cannot be implicitly stored in `jb', it's
* alternatively stored explicitly in `sigs'. The `error' stores
* the value of `errno'.
*/
#if PTH_MCTX_MTH(mcsc)
#include <ucontext.h>
#endif
typedef struct pth_mctx_st pth_mctx_t;
struct pth_mctx_st {
#if PTH_MCTX_MTH(mcsc)
ucontext_t uc;
#elif PTH_MCTX_MTH(sjlj)
pth_sigjmpbuf jb;
#else
#error "unknown mctx method"
#endif
sigset_t sigs;
#if PTH_MCTX_DSP(sjlje)
sigset_t block;
#endif
int error;
};
/*
** ____ MACHINE STATE SWITCHING ______________________________________
*/
/*
* save the current machine context
*/
#if PTH_MCTX_MTH(mcsc)
#define pth_mctx_save(mctx) \
( (mctx)->error = errno, \
getcontext(&(mctx)->uc) )
#elif PTH_MCTX_MTH(sjlj) && PTH_MCTX_DSP(sjlje)
#define pth_mctx_save(mctx) \
( (mctx)->error = errno, \
sigprocmask(SIG_SETMASK, &((mctx)->block), NULL), \
pth_sigsetjmp((mctx)->jb) )
#elif PTH_MCTX_MTH(sjlj)
#define pth_mctx_save(mctx) \
( (mctx)->error = errno, \
pth_sigsetjmp((mctx)->jb) )
#else
#error "unknown mctx method"
#endif
/*
* restore the current machine context
* (at the location of the old context)
*/
#if PTH_MCTX_MTH(mcsc)
#define pth_mctx_restore(mctx) \
( errno = (mctx)->error, \
(void)setcontext(&(mctx)->uc) )
#elif PTH_MCTX_MTH(sjlj)
#define pth_mctx_restore(mctx) \
( errno = (mctx)->error, \
(void)pth_siglongjmp((mctx)->jb, 1) )
#else
#error "unknown mctx method"
#endif
/*
* restore the current machine context
* (at the location of the new context)
*/
#if PTH_MCTX_MTH(sjlj) && PTH_MCTX_DSP(sjlje)
#define pth_mctx_restored(mctx) \
sigprocmask(SIG_SETMASK, &((mctx)->sigs), NULL)
#else
#define pth_mctx_restored(mctx) \
/*nop*/
#endif
/*
* switch from one machine context to another
*/
#define SWITCH_DEBUG_LINE \
"==== THREAD CONTEXT SWITCH ==========================================="
#ifdef PTH_DEBUG
#define _pth_mctx_switch_debug pth_debug(NULL, 0, 1, SWITCH_DEBUG_LINE);
#else
#define _pth_mctx_switch_debug /*NOP*/
#endif
#if PTH_MCTX_MTH(mcsc)
#define pth_mctx_switch(old,new) \
_pth_mctx_switch_debug \
swapcontext(&((old)->uc), &((new)->uc));
#elif PTH_MCTX_MTH(sjlj)
#define pth_mctx_switch(old,new) \
_pth_mctx_switch_debug \
if (pth_mctx_save(old) == 0) \
pth_mctx_restore(new); \
pth_mctx_restored(old);
#else
#error "unknown mctx method"
#endif
#endif /* cpp */
/*
** ____ MACHINE STATE INITIALIZATION ________________________________
*/
#if PTH_MCTX_MTH(mcsc)
/*
* VARIANT 1: THE STANDARDIZED SVR4/SUSv2 APPROACH
*
* This is the preferred variant, because it uses the standardized
* SVR4/SUSv2 makecontext(2) and friends which is a facility intended
* for user-space context switching. The thread creation therefore is
* straight-foreward.
*/
intern int pth_mctx_set(
pth_mctx_t *mctx, void (*func)(void), char *sk_addr_lo, char *sk_addr_hi)
{
/* fetch current context */
if (getcontext(&(mctx->uc)) != 0)
return FALSE;
/* remove parent link */
mctx->uc.uc_link = NULL;
/* configure new stack */
mctx->uc.uc_stack.ss_sp = pth_skaddr(makecontext, sk_addr_lo, sk_addr_hi-sk_addr_lo);
mctx->uc.uc_stack.ss_size = pth_sksize(makecontext, sk_addr_lo, sk_addr_hi-sk_addr_lo);
mctx->uc.uc_stack.ss_flags = 0;
/* configure startup function (with no arguments) */
makecontext(&(mctx->uc), func, 0+1);
return TRUE;
}
#elif PTH_MCTX_MTH(sjlj) &&\
!PTH_MCTX_DSP(sjljlx) &&\
!PTH_MCTX_DSP(sjljisc) &&\
!PTH_MCTX_DSP(sjljw32)
/*
* VARIANT 2: THE SIGNAL STACK TRICK
*
* This uses sigstack/sigaltstack() and friends and is really the
* most tricky part of Pth. When you understand the following
* stuff you're a good Unix hacker and then you've already
* understood the gory ingredients of Pth. So, either welcome to
* the club of hackers, or do yourself a favor and skip this ;)
*
* The ingenious fact is that this variant runs really on _all_ POSIX
* compliant systems without special platform kludges. But be _VERY_
* carefully when you change something in the following code. The slightest
* change or reordering can lead to horribly broken code. Really every
* function call in the following case is intended to be how it is, doubt
* me...
*
* For more details we strongly recommend you to read the companion
* paper ``Portable Multithreading -- The Signal Stack Trick for
* User-Space Thread Creation'' from Ralf S. Engelschall. A copy of the
* draft of this paper you can find in the file rse-pmt.ps inside the
* GNU Pth distribution.
*/
#if !defined(SA_ONSTACK) && defined(SV_ONSTACK)
#define SA_ONSTACK SV_ONSTACK
#endif
#if !defined(SS_DISABLE) && defined(SA_DISABLE)
#define SS_DISABLE SA_DISABLE
#endif
#if PTH_MCTX_STK(sas) && !defined(HAVE_SS_SP) && defined(HAVE_SS_BASE)
#define ss_sp ss_base
#endif
static volatile jmp_buf mctx_trampoline;
static volatile pth_mctx_t mctx_caller;
static volatile sig_atomic_t mctx_called;
static pth_mctx_t * volatile mctx_creating;
static void (* volatile mctx_creating_func)(void);
static volatile sigset_t mctx_creating_sigs;
static void pth_mctx_set_trampoline(int);
static void pth_mctx_set_bootstrap(void);
/* initialize a machine state */
intern int pth_mctx_set(
pth_mctx_t *mctx, void (*func)(void), char *sk_addr_lo, char *sk_addr_hi)
{
struct sigaction sa;
struct sigaction osa;
#if PTH_MCTX_STK(sas) && defined(HAVE_STACK_T)
stack_t ss;
stack_t oss;
#elif PTH_MCTX_STK(sas)
struct sigaltstack ss;
struct sigaltstack oss;
#elif PTH_MCTX_STK(ss)
struct sigstack ss;
struct sigstack oss;
#else
#error "unknown mctx stack setup"
#endif
sigset_t osigs;
sigset_t sigs;
pth_debug1("pth_mctx_set: enter");
/*
* Preserve the SIGUSR1 signal state, block SIGUSR1,
* and establish our signal handler. The signal will
* later transfer control onto the signal stack.
*/
sigemptyset(&sigs);
sigaddset(&sigs, SIGUSR1);
sigprocmask(SIG_BLOCK, &sigs, &osigs);
sa.sa_handler = pth_mctx_set_trampoline;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_ONSTACK;
if (sigaction(SIGUSR1, &sa, &osa) != 0)
return FALSE;
/*
* Set the new stack.
*
* For sigaltstack we're lucky [from sigaltstack(2) on
* FreeBSD 3.1]: ``Signal stacks are automatically adjusted
* for the direction of stack growth and alignment
* requirements''
*
* For sigstack we have to decide ourself [from sigstack(2)
* on Solaris 2.6]: ``The direction of stack growth is not
* indicated in the historical definition of struct sigstack.
* The only way to portably establish a stack pointer is for
* the application to determine stack growth direction.''
*/
#if PTH_MCTX_STK(sas)
ss.ss_sp = pth_skaddr(sigaltstack, sk_addr_lo, sk_addr_hi-sk_addr_lo);
ss.ss_size = pth_sksize(sigaltstack, sk_addr_lo, sk_addr_hi-sk_addr_lo);
ss.ss_flags = 0;
if (sigaltstack(&ss, &oss) < 0)
return FALSE;
#elif PTH_MCTX_STK(ss)
ss.ss_sp = pth_skaddr(sigstack, sk_addr_lo, sk_addr_hi-sk_addr_lo);
ss.ss_onstack = 0;
if (sigstack(&ss, &oss) < 0)
return FALSE;
#else
#error "unknown mctx stack setup"
#endif
/*
* Now transfer control onto the signal stack and set it up.
* It will return immediately via "return" after the setjmp()
* was performed. Be careful here with race conditions. The
* signal can be delivered the first time sigsuspend() is
* called.
*/
mctx_called = FALSE;
kill(getpid(), SIGUSR1);
sigfillset(&sigs);
sigdelset(&sigs, SIGUSR1);
while (!mctx_called)
sigsuspend(&sigs);
/*
* Inform the system that we are back off the signal stack by
* removing the alternative signal stack. Be careful here: It
* first has to be disabled, before it can be removed.
*/
#if PTH_MCTX_STK(sas)
sigaltstack(NULL, &ss);
ss.ss_flags = SS_DISABLE;
if (sigaltstack(&ss, NULL) < 0)
return FALSE;
sigaltstack(NULL, &ss);
if (!(ss.ss_flags & SS_DISABLE))
return_errno(FALSE, EIO);
if (!(oss.ss_flags & SS_DISABLE))
sigaltstack(&oss, NULL);
#elif PTH_MCTX_STK(ss)
if (sigstack(&oss, NULL))
return FALSE;
#endif
/*
* Restore the old SIGUSR1 signal handler and mask
*/
sigaction(SIGUSR1, &osa, NULL);
sigprocmask(SIG_SETMASK, &osigs, NULL);
/*
* Initialize additional ingredients of the machine
* context structure.
*/
#if PTH_MCTX_DSP(sjlje)
sigemptyset(&mctx->block);
#endif
sigemptyset(&mctx->sigs);
mctx->error = 0;
/*
* Tell the trampoline and bootstrap function where to dump
* the new machine context, and what to do afterwards...
*/
mctx_creating = mctx;
mctx_creating_func = func;
memcpy((void *)&mctx_creating_sigs, &osigs, sizeof(sigset_t));
/*
* Now enter the trampoline again, but this time not as a signal
* handler. Instead we jump into it directly. The functionally
* redundant ping-pong pointer arithmentic is neccessary to avoid
* type-conversion warnings related to the `volatile' qualifier and
* the fact that `jmp_buf' usually is an array type.
*/
if (pth_mctx_save((pth_mctx_t *)&mctx_caller) == 0)
longjmp(*((jmp_buf *)&mctx_trampoline), 1);
/*
* Ok, we returned again, so now we're finished
*/
pth_debug1("pth_mctx_set: leave");
return TRUE;
}
/* trampoline signal handler */
static void pth_mctx_set_trampoline(int sig)
{
/*
* Save current machine state and _immediately_ go back with
* a standard "return" (to stop the signal handler situation)
* to let him remove the stack again. Notice that we really
* have do a normal "return" here, or the OS would consider
* the thread to be running on a signal stack which isn't
* good (for instance it wouldn't allow us to spawn a thread
* from within a thread, etc.)
*
* The functionally redundant ping-pong pointer arithmentic is again
* neccessary to avoid type-conversion warnings related to the
* `volatile' qualifier and the fact that `jmp_buf' usually is an
* array type.
*
* Additionally notice that we INTENTIONALLY DO NOT USE pth_mctx_save()
* here. Instead we use a plain setjmp(3) call because we have to make
* sure the alternate signal stack environment is _NOT_ saved into the
* machine context (which can be the case for sigsetjmp(3) on some
* platforms).
*/
if (setjmp(*((jmp_buf *)&mctx_trampoline)) == 0) {
pth_debug1("pth_mctx_set_trampoline: return to caller");
mctx_called = TRUE;
return;
}
pth_debug1("pth_mctx_set_trampoline: reentered from caller");
/*
* Ok, the caller has longjmp'ed back to us, so now prepare
* us for the real machine state switching. We have to jump
* into another function here to get a new stack context for
* the auto variables (which have to be auto-variables
* because the start of the thread happens later). Else with
* PIC (i.e. Position Independent Code which is used when PTH
* is built as a shared library) most platforms would
* horrible core dump as experience showed.
*/
pth_mctx_set_bootstrap();
}
/* boot function */
static void pth_mctx_set_bootstrap(void)
{
pth_mctx_t * volatile mctx_starting;
void (* volatile mctx_starting_func)(void);
/*
* Switch to the final signal mask (inherited from parent)
*/
sigprocmask(SIG_SETMASK, (sigset_t *)&mctx_creating_sigs, NULL);
/*
* Move startup details from static storage to local auto
* variables which is necessary because it has to survive in
* a local context until the thread is scheduled for real.
*/
mctx_starting = mctx_creating;
mctx_starting_func = mctx_creating_func;
/*
* Save current machine state (on new stack) and
* go back to caller until we're scheduled for real...
*/
pth_debug1("pth_mctx_set_trampoline_jumpin: switch back to caller");
pth_mctx_switch((pth_mctx_t *)mctx_starting, (pth_mctx_t *)&mctx_caller);
/*
* The new thread is now running: GREAT!
* Now we just invoke its init function....
*/
pth_debug1("pth_mctx_set_trampoline_jumpin: reentered from scheduler");
mctx_starting_func();
abort();
}
#elif PTH_MCTX_MTH(sjlj) && PTH_MCTX_DSP(sjljlx)
/*
* VARIANT 3: LINUX SPECIFIC JMP_BUF FIDDLING
*
* Oh hell, I really love it when Linux guys talk about their "POSIX
* compliant system". It's far away from POSIX compliant, IMHO. Autoconf
* finds sigstack/sigaltstack() on Linux, yes. But it doesn't work. Why?
* Because on Linux below version 2.2 and glibc versions below 2.1 these
* two functions are nothing more than silly stub functions which always
* return just -1. Very useful, yeah...
*/
#include <features.h>
intern int pth_mctx_set(
pth_mctx_t *mctx, void (*func)(void), char *sk_addr_lo, char *sk_addr_hi)
{
pth_mctx_save(mctx);
#if defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
&& __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(JB_PC) && defined(JB_SP)
mctx->jb[0].__jmpbuf[JB_PC] = (int)func;
mctx->jb[0].__jmpbuf[JB_SP] = (int)sk_addr_hi;
#elif defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
&& __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(__mc68000__)
mctx->jb[0].__jmpbuf[0].__aregs[0] = (long int)func;
mctx->jb[0].__jmpbuf[0].__sp = (int *)sk_addr_hi;
#elif defined(__GNU_LIBRARY__) && defined(__i386__)
mctx->jb[0].__jmpbuf[0].__pc = (char *)func;
mctx->jb[0].__jmpbuf[0].__sp = sk_addr_hi;
#else
#error "Unsupported Linux (g)libc version and/or platform"
#endif
sigemptyset(&mctx->sigs);
mctx->error = 0;
return TRUE;
}
/*
* VARIANT 4: INTERACTIVE SPECIFIC JMP_BUF FIDDLING
*
* No wonder, Interactive Unix (ISC) 4.x contains Microsoft code, so
* it's clear that this beast lacks both sigstack and sigaltstack (about
* makecontext we not even have to talk). So our only chance is to
* fiddle with it's jmp_buf ingredients, of course. We support only i386
* boxes.
*/
#elif PTH_MCTX_MTH(sjlj) && PTH_MCTX_DSP(sjljisc)
intern int
pth_mctx_set(pth_mctx_t *mctx, void (*func)(void),
char *sk_addr_lo, char *sk_addr_hi)
{
pth_mctx_save(mctx);
#if i386
mctx->jb[4] = (int)sk_addr_hi - sizeof(mctx->jb);
mctx->jb[5] = (int)func;
#else
#error "Unsupported ISC architecture"
#endif
sigemptyset(&mctx->sigs);
mctx->error = 0;
return TRUE;
}
/*
* VARIANT 5: WIN32 SPECIFIC JMP_BUF FIDDLING
*
* Oh hell, Win32 has setjmp(3), but no sigstack(2) or sigaltstack(2).
* So we have to fiddle around with the jmp_buf here too...
*/
#elif PTH_MCTX_MTH(sjlj) && PTH_MCTX_DSP(sjljw32)
intern int
pth_mctx_set(pth_mctx_t *mctx, void (*func)(void),
char *sk_addr_lo, char *sk_addr_hi)
{
pth_mctx_save(mctx);
#if i386
mctx->jb[7] = (int)sk_addr_hi;
mctx->jb[8] = (int)func;
#else
#error "Unsupported Win32 architecture"
#endif
sigemptyset(&mctx->sigs);
mctx->error = 0;
return TRUE;
}
/*
* VARIANT X: JMP_BUF FIDDLING FOR ONE MORE ESOTERIC OS
* Add the jmp_buf fiddling for your esoteric OS here...
*
#elif PTH_MCTX_MTH(sjlj) && PTH_MCTX_DSP(sjljeso)
intern int
pth_mctx_set(pth_mctx_t *mctx, void (*func)(void),
char *sk_addr_lo, char *sk_addr_hi)
{
pth_mctx_save(mctx);
sigemptyset(&mctx->sigs);
mctx->error = 0;
...start hacking here...
mctx->.... = func;
mctx->.... = sk_addr_hi;
mctx->.... = sk_addr_lo;
return TRUE;
}
*/
#else
#error "unknown mctx method"
#endif

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/*
** GNU Pth - The GNU Portable Threads
** Copyright (c) 1999-2001 Ralf S. Engelschall <rse@engelschall.com>
**
** This file is part of GNU Pth, a non-preemptive thread scheduling
** library which can be found at http://www.gnu.org/software/pth/.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
** USA, or contact Ralf S. Engelschall <rse@engelschall.com>.
**
** pth_p.h: Pth private API definitions
*/
#ifndef _PTH_P_H_
#define _PTH_P_H_
/* mandatory system headers */
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <setjmp.h>
#include <signal.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <time.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/socket.h>
/* library version */
#define _PTH_VERS_C_AS_HEADER_
#include "pth_vers.c"
#undef _PTH_VERS_C_AS_HEADER_
/* public API headers */
#define _PTH_PRIVATE
#include "pth.h"
#undef _PTH_PRIVATE
/* autoconf defines and macros */
#include "pth_acdef.h"
#include "pth_acmac.h"
/* optional system headers */
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#ifdef HAVE_NET_ERRNO_H
#include <net/errno.h>
#endif
/* dmalloc support */
#ifdef PTH_DMALLOC
#include <dmalloc.h>
#endif
/* paths */
#ifdef HAVE_PATHS_H
#include <paths.h>
#endif
#ifdef _PATH_BSHELL
#define PTH_PATH_BINSH _PATH_BSHELL
#else
#define PTH_PATH_BINSH "/bin/sh"
#endif
/* non-blocking flags */
#ifdef O_NONBLOCK
#define O_NONBLOCKING O_NONBLOCK
#else
#ifdef O_NDELAY
#define O_NONBLOCKING O_NDELAY
#else
#ifdef FNDELAY
#define O_NONBLOCKING FNDELAY
#else
#error "No O_NONBLOCK, O_NDELAY or FNDELAY flag available!"
#endif
#endif
#endif
/* compiler happyness: avoid ``empty compilation unit'' problem */
#define COMPILER_HAPPYNESS(name) \
int __##name##_unit = 0;
/* generated contents */
BEGIN_DECLARATION
==#==
END_DECLARATION
#endif /* _PTH_P_H_ */

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/*
** pth_vers.c -- Version Information for GNU Pth (syntax: C/C++)
** [automatically generated and maintained by GNU shtool]
*/
#ifdef _PTH_VERS_C_AS_HEADER_
#ifndef _PTH_VERS_C_
#define _PTH_VERS_C_
#define PTH_INTERNAL_VERSION 0x104200
typedef struct {
const int v_hex;
const char *v_short;
const char *v_long;
const char *v_tex;
const char *v_gnu;
const char *v_web;
const char *v_sccs;
const char *v_rcs;
} pth_internal_version_t;
extern pth_internal_version_t pth_internal_version;
#endif /* _PTH_VERS_C_ */
#else /* _PTH_VERS_C_AS_HEADER_ */
#define _PTH_VERS_C_AS_HEADER_
#include "pth_vers.c"
#undef _PTH_VERS_C_AS_HEADER_
pth_internal_version_t pth_internal_version = {
0x104200,
"1.4.0",
"1.4.0 (24-Mar-2001)",
"This is GNU Pth, Version 1.4.0 (24-Mar-2001)",
"GNU Pth 1.4.0 (24-Mar-2001)",
"GNU Pth/1.4.0",
"@(#)GNU Pth 1.4.0 (24-Mar-2001)",
"$Id$"
};
#endif /* _PTH_VERS_C_AS_HEADER_ */

1492
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36
gst/cothreads/test-pth.c Normal file
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#include "pth_p.h"
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
pth_mctx_t main_context;
void thread_1 (char *str)
{
printf ("sleeping 5s in thread 1...\n");
sleep (5);
printf ("returning to thread 0\n");
pth_mctx_restore (&main_context);
}
int main (int argc, char *argv[])
{
pth_mctx_t ctx;
char *skaddr;
pth_mctx_save (&main_context);
skaddr = malloc (64 * 1024);
pth_mctx_set (&ctx, thread_1, skaddr, skaddr + 64 * 1024);
printf ("switching to thread 1...");
pth_mctx_switch (&main_context, &ctx);
printf ("back now, exiting.\n");
exit (0);
}