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45a4d305fd
Original commit message from CVS: the cothreads library now builds, but it's untested the public api is in cothreads.h
112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/* Pthread-friendly coroutines with pth
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* Copyright (C) 2002 Andy Wingo <wingo@pobox.com>
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*
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* cothread.c: public API implementation
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "cothreads-private.h"
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#ifdef HAVE_LINUXTHREADS
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static cothread_attr cothread_attr_default =
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{
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COTHREAD_ATTR_METHOD_LINUXTHREADS, /* use the linuxthreads hack */
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0x200000, /* 2 MB */
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8, /* for a stack size of 256 KB */
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TRUE /* set up the first chunk */
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};
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#else
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static cothread_attr cothread_attr_default =
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{
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COTHREAD_ATTR_METHOD_GTHREAD_STACK, /* this is what the old cothreads code does */
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0x100000, /* only 1 MB due the the FreeBSD defaults */
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8, /* for a stack size of 128 KB */
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TRUE /* set up the first chunk */
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};
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#endif
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cothread_attr *_cothread_attr_global = NULL;
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static gboolean (*stack_alloc_func) (char**, char**);
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cothread*
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cothread_init (cothread_attr *attr)
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{
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static cothread_attr _attr;
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if (_cothread_attr_global) {
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g_warning ("cothread system has already been initialized");
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return;
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}
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if (!attr)
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_attr = cothread_attr_default;
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else
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_attr = *attr;
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_cothread_attr_global = &_attr;
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switch (_cothread_attr_global->method) {
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case COTHREAD_ATTR_METHOD_MALLOC:
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stack_alloc_func = cothread_stack_alloc_on_heap;
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break;
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case COTHREAD_ATTR_METHOD_GTHREAD_STACK:
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stack_alloc_func = cothread_stack_alloc_on_gthread_stack;
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break;
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case COTHREAD_ATTR_METHOD_LINUXTHREADS:
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stack_alloc_func = cothread_stack_alloc_linuxthreads;
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break;
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default:
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g_error ("unexpected value for attr method %d", _cothread_attr_global->method);
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}
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return cothread_create (NULL);
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}
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cothread*
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cothread_create (void (*func)(void))
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{
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char *low, *high;
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cothread *ret = g_new0 (cothread, 1);
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if (!func) {
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/* we are being asked to save the current thread into a new cothread. this
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* only happens for the first cothread. */
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if (_cothread_attr_global->alloc_cothread_0)
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if (!stack_alloc_func (&low, &high))
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g_error ("couldn't create cothread 0");
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pth_mctx_save (ret);
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return ret;
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}
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if (!stack_alloc_func (&low, &high))
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g_error ("could not allocate a new cothread stack");
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pth_mctx_set (ret, func, low, high);
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return ret;
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}
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void
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cothread_destroy (cothread *thread)
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{
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/* FIXME: have method-specific destroy functions. */
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g_free (thread);
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}
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