d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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

Browse Source 
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
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=145959
1 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
lib/libc/gmon/mcount.c
View File

@ -49,6 +49,7 @@ void btrap(void);
void eintr(void);
void user(void);
#endif
#include <machine/atomic.h>
/*
* 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
MCOUNT_ENTER(s);
#else
p->state = GMON_PROF_BUSY;
if (!atomic_cmpset_acq_int(&p->state, GMON_PROF_ON, GMON_PROF_BUSY))
return;
#endif
frompci = frompc - p->lowpc;
@ -260,11 +262,11 @@ _MCOUNT_DECL(uintfptr_t frompc, uintfptr_t selfpc)
#ifdef _KERNEL
MCOUNT_EXIT(s);
#else
p->state = GMON_PROF_ON;
atomic_store_rel_int(&p->state, GMON_PROF_ON);
#endif
return;
overflow:
p->state = GMON_PROF_ERROR;
atomic_store_rel_int(&p->state, GMON_PROF_ERROR);
#ifdef _KERNEL
MCOUNT_EXIT(s);
#endif