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Move stack_top code from cothread_create() to cothread_context_init(), since we only need to calculate it once.

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Original commit message from CVS:
Move stack_top code from cothread_create() to cothread_context_init(),
since we only need to calculate it once.
This commit is contained in:
David Schleef 2002-11-15 09:51:41 +00:00
parent 852761c9dc
commit 179a63446c
1 changed files with 18 additions and 3 deletions
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21
gst/cothreads.c
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@ -56,6 +56,7 @@ struct _cothread_context
cothread_state *cothreads[COTHREAD_MAXTHREADS]; /* array of cothread states */ cothread_state *cothreads[COTHREAD_MAXTHREADS]; /* array of cothread states */
int ncothreads; int ncothreads;
int current; int current;
unsigned long stack_top;
GHashTable *data; GHashTable *data;
}; };
@ -82,6 +83,7 @@ cothread_context *
cothread_context_init (void) cothread_context_init (void)
{ {
cothread_context *ctx; cothread_context *ctx;
void *sp;
/* if there already is a cotread context for this thread, /* if there already is a cotread context for this thread,
* just return it */ * just return it */
@ -118,6 +120,17 @@ cothread_context_init (void)
memset (ctx->cothreads, 0, sizeof (ctx->cothreads)); 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
*/
/* 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;
GST_DEBUG (GST_CAT_COTHREADS, "stack top is %lu", ctx->stack_top);
/* /*
* initialize the 0th cothread * initialize the 0th cothread
*/ */
@ -174,8 +187,8 @@ cothread_state*
cothread_create (cothread_context *ctx) cothread_create (cothread_context *ctx)
{ {
cothread_state *cothread; cothread_state *cothread;
void *sp; //void *sp;
unsigned long stack_top; //unsigned long stack_top;
void *mmaped = 0; void *mmaped = 0;
gint slot = 0; gint slot = 0;
@ -200,6 +213,7 @@ cothread_create (cothread_context *ctx)
GST_DEBUG (GST_CAT_COTHREADS, "Found free cothread slot %d", slot); GST_DEBUG (GST_CAT_COTHREADS, "Found free cothread slot %d", slot);
#if 0
sp = CURRENT_STACK_FRAME; sp = CURRENT_STACK_FRAME;
/* FIXME this may not be 64bit clean /* FIXME this may not be 64bit clean
* could use casts to uintptr_t from inttypes.h * could use casts to uintptr_t from inttypes.h
@ -210,10 +224,11 @@ cothread_create (cothread_context *ctx)
* aligned. */ * aligned. */
stack_top = ((gulong) sp | (STACK_SIZE - 1)) + 1; stack_top = ((gulong) sp | (STACK_SIZE - 1)) + 1;
GST_DEBUG (GST_CAT_COTHREADS, "stack top is %lu", stack_top); GST_DEBUG (GST_CAT_COTHREADS, "stack top is %lu", stack_top);
#endif
/* cothread stack space of the thread is mapped in reverse, with cothread 0 /* cothread stack space of the thread is mapped in reverse, with cothread 0
* stack space at the top */ * stack space at the top */
cothread = (cothread_state *) (stack_top - (slot + 1) * COTHREAD_STACKSIZE); cothread = (cothread_state *) (ctx->stack_top - (slot + 1) * COTHREAD_STACKSIZE);
GST_DEBUG (GST_CAT_COTHREADS, GST_DEBUG (GST_CAT_COTHREADS,
"mmap cothread slot stack from %p to 0x%lx (size 0x%lx)", "mmap cothread slot stack from %p to 0x%lx (size 0x%lx)",