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Make prof's cum_gctx a C11-style atomic

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David Goldblatt 2017-04-04 18:36:45 -07:00 committed by David Goldblatt
parent 5dcc13b342
commit 074f2256ca
1 changed files with 2 additions and 2 deletions
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4
src/prof.c
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@ -63,7 +63,7 @@ size_t lg_prof_sample;
* creating/destroying mutexes. * creating/destroying mutexes.
*/ */
static malloc_mutex_t *gctx_locks; static malloc_mutex_t *gctx_locks;
static unsigned cum_gctxs; /* Atomic counter. */ static atomic_u_t cum_gctxs; /* Atomic counter. */
/* /*
* Table of mutexes that are shared among tdata's. No operations require * Table of mutexes that are shared among tdata's. No operations require
@ -524,7 +524,7 @@ prof_backtrace(prof_bt_t *bt) {
static malloc_mutex_t * static malloc_mutex_t *
prof_gctx_mutex_choose(void) { prof_gctx_mutex_choose(void) {
unsigned ngctxs = atomic_add_u(&cum_gctxs, 1); unsigned ngctxs = atomic_fetch_add_u(&cum_gctxs, 1, ATOMIC_RELAXED);
return &gctx_locks[(ngctxs - 1) % PROF_NCTX_LOCKS]; return &gctx_locks[(ngctxs - 1) % PROF_NCTX_LOCKS];
} }