gstreamer/gst/cothreads/cothreads.h

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/* Pthread-friendly coroutines with pth
* Copyright (C) 2002 Andy Wingo <wingo@pobox.com>
*
* cothread.h: public API
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library 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.
*/
#ifndef __COTHREAD_H__
#define __COTHREAD_H__
#include <glib.h>
#include <pth_p.h>
#ifndef CURRENT_STACK_FRAME
#define CURRENT_STACK_FRAME ({ char __csf; &__csf; })
#endif /* CURRENT_STACK_FRAME */
typedef pth_mctx_t cothread;
typedef enum _cothreads_alloc_method cothreads_alloc_method;
typedef struct _cothreads_config cothreads_config;
enum _cothreads_alloc_method
{
COTHREADS_ALLOC_METHOD_MALLOC, /* cothread stacks on the heap, one block per chunk */
COTHREADS_ALLOC_METHOD_GTHREAD_STACK, /* cothread stacks within the current gthread's stack */
COTHREADS_ALLOC_METHOD_LINUXTHREADS, /* a hack that allows for linuxthreads compatibility */
};
struct _cothreads_config {
cothreads_alloc_method method; /* the method of allocating new cothread stacks */
int chunk_size; /* size of contiguous chunk of memory for cothread stacks */
int blocks_per_chunk; /* cothreads per chunk */
gboolean alloc_cothread_0; /* if the first cothread needs to be allocated */
};
#define COTHREADS_CONFIG_HEAP_INITIALIZER { \
COTHREADS_ALLOC_METHOD_MALLOC, /* each cothread on the heap */ \
0x20000, /* stack size of 128 kB */ \
1, /* we aren't chunked */ \
FALSE /* nothing special for cothread 0 */ \
}
#define COTHREADS_CONFIG_GTHREAD_INITIALIZER { \
COTHREADS_ALLOC_METHOD_GTHREAD_STACK, /* this is what the old cothreads code does */ \
0x100000, /* only 1 MB due the the FreeBSD defaults */ \
8, /* for a stack size of 128 KB */ \
TRUE /* set up the first chunk */ \
}
#define COTHREADS_CONFIG_LINUXTHREADS_INITIALIZER { \
COTHREADS_ALLOC_METHOD_LINUXTHREADS, /* use the linuxthreads hack */ \
0x200000, /* 2 MB */ \
8, /* for a stack size of 256 KB */ \
TRUE /* set up the first chunk */ \
}
gboolean cothreads_initialized (void);
void cothreads_init (cothreads_config *config);
cothread* cothread_create (void (*func)(int, void**), int argc, void **argv);
void cothread_destroy (cothread *thread);
/* 'old' and 'new' are of type (cothread*) */
#define cothread_switch(old,new) pth_mctx_switch(old,new)
#define cothread_yield(new) pth_mctx_restore(new);
#endif /* __COTHREAD_H__ */