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Convert extent module to use C11-style atomcis

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David Goldblatt 2017-04-04 18:20:42 -07:00 committed by David Goldblatt
parent 30d74db08e
commit 492a941f49
1 changed files with 10 additions and 8 deletions
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18
src/extent.c
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@ -62,8 +62,8 @@ const extent_hooks_t extent_hooks_default = {
};
/* Used exclusively for gdump triggering. */
static size_t curpages;
static size_t highpages;
static atomic_zu_t curpages;
static atomic_zu_t highpages;
/******************************************************************************/
/*
@ -566,14 +566,16 @@ extent_gdump_add(tsdn_t *tsdn, const extent_t *extent) {
if (opt_prof && extent_state_get(extent) == extent_state_active) {
size_t nadd = extent_size_get(extent) >> LG_PAGE;
size_t cur = atomic_add_zu(&curpages, nadd);
size_t high = atomic_read_zu(&highpages);
while (cur > high && atomic_cas_zu(&highpages, high, cur)) {
size_t cur = atomic_fetch_add_zu(&curpages, nadd,
ATOMIC_RELAXED) + nadd;
size_t high = atomic_load_zu(&highpages, ATOMIC_RELAXED);
while (cur > high && !atomic_compare_exchange_weak_zu(
&highpages, &high, cur, ATOMIC_RELAXED, ATOMIC_RELAXED)) {
/*
* Don't refresh cur, because it may have decreased
* since this thread lost the highpages update race.
* Note that high is updated in case of CAS failure.
*/
high = atomic_read_zu(&highpages);
}
if (cur > high && prof_gdump_get_unlocked()) {
prof_gdump(tsdn);
@ -587,8 +589,8 @@ extent_gdump_sub(tsdn_t *tsdn, const extent_t *extent) {
if (opt_prof && extent_state_get(extent) == extent_state_active) {
size_t nsub = extent_size_get(extent) >> LG_PAGE;
assert(atomic_read_zu(&curpages) >= nsub);
atomic_sub_zu(&curpages, nsub);
assert(atomic_load_zu(&curpages, ATOMIC_RELAXED) >= nsub);
atomic_fetch_sub_zu(&curpages, nsub, ATOMIC_RELAXED);
}
}