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Move atomic statscounter next to the non-atomic definition

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Aydın Mercan 2023-12-11 17:26:04 +03:00 committed by Petr Špaček
parent bb96142a17
commit 9c4dd863a6
2 changed files with 12 additions and 11 deletions
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2
lib/isc/include/isc/types.h
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@ -20,6 +20,7 @@
* OS-specific types, from the OS-specific include directories.
*/
#include <limits.h>
#include <stdatomic.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
@ -72,6 +73,7 @@ typedef ISC_LIST(isc_sockaddr_t) isc_sockaddrlist_t; /*%< Socket Address List
* */
typedef struct isc_stats isc_stats_t; /*%< Statistics */
typedef int_fast64_t isc_statscounter_t;
typedef atomic_int_fast64_t isc_atomic_statscounter_t;
typedef struct isc_symtab isc_symtab_t; /*%< Symbol Table */
typedef struct isc_textregion isc_textregion_t; /*%< Text Region */
typedef struct isc_time isc_time_t; /*%< Time */

21
lib/isc/stats.c
View file

@ -27,16 +27,14 @@
#define ISC_STATS_MAGIC ISC_MAGIC('S', 't', 'a', 't')
#define ISC_STATS_VALID(x) ISC_MAGIC_VALID(x, ISC_STATS_MAGIC)
typedef atomic_int_fast64_t isc__atomic_statcounter_t;
/*
* Statistics are counted with an atomic int_fast64_t but exported to functions
* taking int64_t (isc_stats_dumper_t). A 128-bit native and fast architecture
* taking uint64_t (isc_stats_dumper_t). A 128-bit native and fast architecture
* doesn't exist in reality so these two are the same thing in practise.
* However, a silent truncation happening silently in the future is still not
* acceptable.
*/
STATIC_ASSERT(sizeof(isc__atomic_statcounter_t) <= sizeof(int64_t),
STATIC_ASSERT(sizeof(isc_statscounter_t) <= sizeof(uint64_t),
"Exported statistics must fit into the statistic counter size");
struct isc_stats {
@ -44,7 +42,7 @@ struct isc_stats {
isc_mem_t *mctx;
isc_refcount_t references;
int ncounters;
isc__atomic_statcounter_t *counters;
isc_atomic_statscounter_t *counters;
};
void
@ -68,7 +66,7 @@ isc_stats_detach(isc_stats_t **statsp) {
if (isc_refcount_decrement(&stats->references) == 1) {
isc_refcount_destroy(&stats->references);
isc_mem_cput(stats->mctx, stats->counters, stats->ncounters,
sizeof(isc__atomic_statcounter_t));
sizeof(isc_atomic_statscounter_t));
isc_mem_putanddetach(&stats->mctx, stats, sizeof(*stats));
}
}
@ -85,7 +83,7 @@ isc_stats_create(isc_mem_t *mctx, isc_stats_t **statsp, int ncounters) {
REQUIRE(statsp != NULL && *statsp == NULL);
isc_stats_t *stats = isc_mem_get(mctx, sizeof(*stats));
size_t counters_alloc_size = sizeof(isc__atomic_statcounter_t) *
size_t counters_alloc_size = sizeof(isc_atomic_statscounter_t) *
ncounters;
stats->counters = isc_mem_get(mctx, counters_alloc_size);
isc_refcount_init(&stats->references, 1);
@ -126,7 +124,8 @@ isc_stats_dump(isc_stats_t *stats, isc_stats_dumper_t dump_fn, void *arg,
REQUIRE(ISC_STATS_VALID(stats));
for (i = 0; i < stats->ncounters; i++) {
int_fast64_t counter = atomic_load_acquire(&stats->counters[i]);
isc_statscounter_t counter =
atomic_load_acquire(&stats->counters[i]);
if ((options & ISC_STATSDUMP_VERBOSE) == 0 && counter == 0) {
continue;
}
@ -170,7 +169,7 @@ void
isc_stats_resize(isc_stats_t **statsp, int ncounters) {
isc_stats_t *stats;
size_t counters_alloc_size;
isc__atomic_statcounter_t *newcounters;
isc_atomic_statscounter_t *newcounters;
REQUIRE(statsp != NULL && *statsp != NULL);
REQUIRE(ISC_STATS_VALID(*statsp));
@ -183,7 +182,7 @@ isc_stats_resize(isc_stats_t **statsp, int ncounters) {
}
/* Grow number of counters. */
counters_alloc_size = sizeof(isc__atomic_statcounter_t) * ncounters;
counters_alloc_size = sizeof(isc_atomic_statscounter_t) * ncounters;
newcounters = isc_mem_get(stats->mctx, counters_alloc_size);
for (int i = 0; i < ncounters; i++) {
atomic_init(&newcounters[i], 0);
@ -193,7 +192,7 @@ isc_stats_resize(isc_stats_t **statsp, int ncounters) {
atomic_store_release(&newcounters[i], counter);
}
isc_mem_cput(stats->mctx, stats->counters, stats->ncounters,
sizeof(isc__atomic_statcounter_t));
sizeof(isc_atomic_statscounter_t));
stats->counters = newcounters;
stats->ncounters = ncounters;
}