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284bfca414
Original commit message from CVS: Added element-level locking support, implemented for cothreads with a mutex held whenever an element is actually currently running. This should be done with atomic variables eventually, but the best I can find is to use <asm/spinlock.h> from the kernel, which brings in too much for my taste. Also increased cothread stack size to 32KB and max cothread count to 64, which fits within the default pthread 2MB stack. It would probably be good to do a pthread_attr_getstacksize() to verify that it's 2MB, and if linuxthreads had a pthread_attr_setstacksize(), we could remove these limits.
94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* cothreads.h: Header for cothreading routines
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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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#ifndef __COTHREADS_H__
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#define __COTHREADS_H__
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#include <glib.h>
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#include <setjmp.h>
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#ifdef HAVE_ATOMIC_H
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#include <asm/atomic.h>
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#endif
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#undef COTHREAD_ATOMIC
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#define COTHREAD_STACKSIZE 32768
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#define COTHREAD_MAXTHREADS 64
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#define STACK_SIZE 0x200000
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#ifndef CURRENT_STACK_FRAME
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#define CURRENT_STACK_FRAME ({ char __csf; &__csf; })
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#endif /* CURRENT_STACK_FRAME */
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typedef struct _cothread_state cothread_state;
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typedef struct _cothread_context cothread_context;
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typedef int (*cothread_func) (int argc,char **argv);
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#define COTHREAD_STARTED 0x01
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struct _cothread_state {
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cothread_context *ctx;
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int threadnum;
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cothread_func func;
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int argc;
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char **argv;
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int flags;
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void *sp;
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jmp_buf jmp;
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/* is this needed any more? */
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void *top_sp;
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void *pc;
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#ifdef COTHREAD_ATOMIC
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atomic_t lock;
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#else
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GMutex *lock;
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#endif
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};
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struct _cothread_context {
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cothread_state *threads[COTHREAD_MAXTHREADS];
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int nthreads;
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int current;
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GHashTable *data;
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};
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cothread_context* cothread_init();
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cothread_state* cothread_create (cothread_context *ctx);
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void cothread_setfunc (cothread_state *thread, cothread_func func,
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int argc, char **argv);
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int cothread_getcurrent (void);
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void cothread_switch (cothread_state *thread);
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void cothread_set_data (cothread_state *thread, gchar *key, gpointer data);
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gpointer cothread_get_data (cothread_state *thread, gchar *key);
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void cothread_lock (cothread_state *thread);
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gboolean cothread_trylock (cothread_state *thread);
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void cothread_unlock (cothread_state *thread);
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cothread_state* cothread_main (cothread_context *ctx);
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#endif /* __COTHREAD_H__ */
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