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runtime: Use getcontext, not setjmp, to save regs for GC. 

From-SVN: r187777
This commit is contained in:
Ian Lance Taylor 2012-05-22 16:57:23 +00:00
parent 3cd50158f5
commit ef1f343258
2 changed files with 4 additions and 7 deletions
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8
libgo/runtime/proc.c
View File

@ -1239,9 +1239,7 @@ runtime_entersyscall(void)
// Save the registers in the g structure so that any pointers
// held in registers will be seen by the garbage collector.
// We could use getcontext here, but setjmp is more efficient
// because it doesn't need to save the signal mask.
setjmp(g->gcregs);
getcontext(&g->gcregs);
g->status = Gsyscall;
@ -1299,7 +1297,7 @@ runtime_exitsyscall(void)
gp->gcstack = nil;
#endif
gp->gcnext_sp = nil;
runtime_memclr(gp->gcregs, sizeof gp->gcregs);
runtime_memclr(&gp->gcregs, sizeof gp->gcregs);
if(m->profilehz > 0)
runtime_setprof(true);
@ -1328,7 +1326,7 @@ runtime_exitsyscall(void)
gp->gcstack = nil;
#endif
gp->gcnext_sp = nil;
runtime_memclr(gp->gcregs, sizeof gp->gcregs);
runtime_memclr(&gp->gcregs, sizeof gp->gcregs);
}
// Allocate a new g, with a stack big enough for stacksize bytes.

3
libgo/runtime/runtime.h
View File

@ -7,7 +7,6 @@
#include "config.h"
#include "go-assert.h"
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
@ -128,7 +127,7 @@ struct G
void* gcnext_segment;
void* gcnext_sp;
void* gcinitial_sp;
jmp_buf gcregs;
ucontext_t gcregs;
byte* entry; // initial function
G* alllink; // on allg
void* param; // passed parameter on wakeup