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Fix race by using atomic operation, with this change, both libpthread

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and libthr now can run profiling on SMP.
This commit is contained in:
David Xu 2005-05-06 07:37:01 +00:00
parent fd94099ec2
commit 0fa2f94316
1 changed files with 5 additions and 3 deletions
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8
lib/libc/gmon/mcount.c
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@ -49,6 +49,7 @@ void btrap(void);
void eintr(void); void eintr(void);
void user(void); void user(void);
#endif #endif
#include <machine/atomic.h>
/* /*
* mcount is called on entry to each function compiled with the profiling * mcount is called on entry to each function compiled with the profiling
@ -92,7 +93,8 @@ _MCOUNT_DECL(uintfptr_t frompc, uintfptr_t selfpc)
#ifdef _KERNEL #ifdef _KERNEL
MCOUNT_ENTER(s); MCOUNT_ENTER(s);
#else #else
p->state = GMON_PROF_BUSY; if (!atomic_cmpset_acq_int(&p->state, GMON_PROF_ON, GMON_PROF_BUSY))
return;
#endif #endif
frompci = frompc - p->lowpc; frompci = frompc - p->lowpc;
@ -260,11 +262,11 @@ done:
#ifdef _KERNEL #ifdef _KERNEL
MCOUNT_EXIT(s); MCOUNT_EXIT(s);
#else #else
p->state = GMON_PROF_ON; atomic_store_rel_int(&p->state, GMON_PROF_ON);
#endif #endif
return; return;
overflow: overflow:
p->state = GMON_PROF_ERROR; atomic_store_rel_int(&p->state, GMON_PROF_ERROR);
#ifdef _KERNEL #ifdef _KERNEL
MCOUNT_EXIT(s); MCOUNT_EXIT(s);
#endif #endif