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Remove GCC-ism used to find current stack pointer, and use this opportunity to clean up the code slightly. Based on ...

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Original commit message from CVS:
Remove GCC-ism used to find current stack pointer, and use this
opportunity to clean up the code slightly.  Based on patch from
Brian Cameron.
This commit is contained in:
David Schleef 2003-01-21 22:01:37 +00:00
parent ef5cc368e7
commit fb27bbee37
2 changed files with 10 additions and 10 deletions
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15
gst/cothreads.c
View file

@ -29,6 +29,9 @@
#include <unistd.h>
#include <errno.h>
#include <sys/mman.h>
#ifdef HAVE_UCONTEXT_H
#include <ucontext.h>
#endif
#include "gst_private.h"
@ -101,8 +104,9 @@ cothread_get_current_context (void)
cothread_context *
cothread_context_init (void)
{
char __csf;
void *current_stack_frame = &__csf; /* Get pointer inside current stack frame */
cothread_context *ctx;
void *sp;
/* if there already is a cotread context for this thread,
* just return it */
@ -136,7 +140,6 @@ cothread_context_init (void)
/* clear the cothread data */
memset (ctx->cothreads, 0, sizeof (ctx->cothreads));
sp = CURRENT_STACK_FRAME;
/* FIXME this may not be 64bit clean
* could use casts to uintptr_t from inttypes.h
* if only all platforms had inttypes.h
@ -144,7 +147,7 @@ cothread_context_init (void)
/* stack_top is the address of the first byte past our stack segment. */
/* FIXME: an assumption is made that the stack segment is STACK_SIZE
* aligned. */
ctx->stack_top = ((gulong) sp | (STACK_SIZE - 1)) + 1;
ctx->stack_top = ((gulong) current_stack_frame | (STACK_SIZE - 1)) + 1;
GST_DEBUG (GST_CAT_COTHREADS, "stack top is 0x%08lx", ctx->stack_top);
/*
@ -158,7 +161,7 @@ cothread_context_init (void)
ctx->cothreads[0]->argv = NULL;
ctx->cothreads[0]->priv = NULL;
ctx->cothreads[0]->flags = COTHREAD_STARTED;
ctx->cothreads[0]->sp = (void *) CURRENT_STACK_FRAME;
ctx->cothreads[0]->sp = (void *) current_stack_frame;
GST_INFO (GST_CAT_COTHREADS, "0th cothread is %p at sp:%p",
ctx->cothreads[0], ctx->cothreads[0]->sp);
@ -445,6 +448,8 @@ cothread_stub (void)
{
cothread_context *ctx = cothread_get_current_context();
cothread_state *cothread = ctx->cothreads[ctx->current];
char __csf;
void *current_stack_frame = &__csf;
GST_DEBUG_ENTER ("");
@ -457,7 +462,7 @@ cothread_stub (void)
GST_DEBUG (GST_CAT_COTHREADS, "cothread[%d] thread->func exited", ctx->current);
GST_DEBUG (GST_CAT_COTHREADS, "sp=%p", CURRENT_STACK_FRAME);
GST_DEBUG (GST_CAT_COTHREADS, "sp=%p", current_stack_frame);
GST_DEBUG (GST_CAT_COTHREADS, "ctx=%p current=%p", ctx,cothread_get_current_context());
g_assert (ctx == cothread_get_current_context());

5
gst/cothreads.h
View file

@ -26,11 +26,6 @@
#include <glib.h>
#include <setjmp.h>
/* this bit is lifted out of glibc */
#ifndef CURRENT_STACK_FRAME
#define CURRENT_STACK_FRAME ({ char __csf; &__csf; })
#endif /* CURRENT_STACK_FRAME */
typedef struct _cothread_state cothread_state;
typedef struct _cothread_context cothread_context;