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runtime: Make all variables used across getcontext volatile.

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From-SVN: r187549
This commit is contained in:
Ian Lance Taylor 2012-05-15 18:56:48 +00:00
parent eb60659578
commit fe725c000b
1 changed files with 17 additions and 10 deletions
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27
libgo/runtime/proc.c
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@ -1322,7 +1322,7 @@ __go_go(void (*fn)(void*), void* arg)
{
byte *sp;
size_t spsize;
G * volatile newg; // volatile to avoid longjmp warning
G *newg;
schedlock();
@ -1363,19 +1363,26 @@ __go_go(void (*fn)(void*), void* arg)
if(sp == nil)
runtime_throw("nil g->stack0");
getcontext(&newg->context);
newg->context.uc_stack.ss_sp = sp;
{
// Avoid warnings about variables clobbered by
// longjmp.
byte * volatile vsp = sp;
size_t volatile vspsize = spsize;
G * volatile vnewg = newg;
getcontext(&vnewg->context);
vnewg->context.uc_stack.ss_sp = vsp;
#ifdef MAKECONTEXT_STACK_TOP
newg->context.uc_stack.ss_sp += spsize;
vnewg->context.uc_stack.ss_sp += vspsize;
#endif
newg->context.uc_stack.ss_size = spsize;
makecontext(&newg->context, kickoff, 0);
vnewg->context.uc_stack.ss_size = vspsize;
makecontext(&vnewg->context, kickoff, 0);
newprocreadylocked(newg);
schedunlock();
newprocreadylocked(vnewg);
schedunlock();
return newg;
//printf(" goid=%d\n", newg->goid);
return vnewg;
}
}
// Put on gfree list. Sched must be locked.