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Code Issues Releases Wiki Activity

Rewrite reference counting in isc_mem to use isc_refcount API

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This commit is contained in:
Ondřej Surý
2018-05-24 14:43:25 +02:00
parent 0a7535ac81
commit 93e8ba1b50
1 changed files with 30 additions and 47 deletions
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77
lib/isc/mem.c
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@@ -27,6 +27,7 @@
#include <isc/mem.h>
#include <isc/msgs.h>
#include <isc/once.h>
#include <isc/refcount.h>
#include <isc/string.h>
#include <isc/mutex.h>
#include <isc/print.h>
@@ -128,7 +129,7 @@ struct isc__mem {
size_t max_size;
bool checkfree;
struct stats * stats;
unsigned int references;
isc_refcount_t references;
char name[16];
void * tag;
size_t quota;
@@ -905,7 +906,7 @@ isc_mem_createx2(size_t init_max_size, size_t target_size,
else
ctx->max_size = init_max_size;
ctx->flags = flags;
ctx->references = 1;
isc_refcount_init(&ctx->references, 1);
memset(ctx->name, 0, sizeof(ctx->name));
ctx->tag = NULL;
ctx->quota = 0;
@@ -1048,7 +1049,7 @@ destroy(isc__mem_t *ctx) {
ctx->malloced -= DEBUG_TABLE_COUNT * sizeof(debuglist_t);
}
#endif
INSIST(ctx->references == 0);
isc_refcount_destroy(&ctx->references);
if (ctx->checkfree) {
for (i = 0; i <= ctx->max_size; i++) {
@@ -1094,13 +1095,12 @@ destroy(isc__mem_t *ctx) {
void
isc__mem_attach(isc_mem_t *source0, isc_mem_t **targetp) {
isc__mem_t *source = (isc__mem_t *)source0;
int_fast32_t refs;
REQUIRE(VALID_CONTEXT(source));
REQUIRE(targetp != NULL && *targetp == NULL);
MCTXLOCK(source, &source->lock);
source->references++;
MCTXUNLOCK(source, &source->lock);
isc_refcount_increment(&source->references, &refs);
*targetp = (isc_mem_t *)source;
}
@@ -1108,21 +1108,17 @@ isc__mem_attach(isc_mem_t *source0, isc_mem_t **targetp) {
void
isc__mem_detach(isc_mem_t **ctxp) {
isc__mem_t *ctx;
bool want_destroy = false;
int_fast32_t refs;
REQUIRE(ctxp != NULL);
ctx = (isc__mem_t *)*ctxp;
REQUIRE(VALID_CONTEXT(ctx));
MCTXLOCK(ctx, &ctx->lock);
INSIST(ctx->references > 0);
ctx->references--;
if (ctx->references == 0)
want_destroy = true;
MCTXUNLOCK(ctx, &ctx->lock);
isc_refcount_decrement(&ctx->references, &refs);
if (want_destroy)
if (refs == 0) {
destroy(ctx);
}
*ctxp = NULL;
}
@@ -1140,9 +1136,9 @@ isc__mem_detach(isc_mem_t **ctxp) {
void
isc___mem_putanddetach(isc_mem_t **ctxp, void *ptr, size_t size FLARG) {
isc__mem_t *ctx;
bool want_destroy = false;
size_info *si;
size_t oldsize;
int_fast32_t refs;
REQUIRE(ctxp != NULL);
ctx = (isc__mem_t *)*ctxp;
@@ -1167,13 +1163,11 @@ isc___mem_putanddetach(isc_mem_t **ctxp, void *ptr, size_t size FLARG) {
}
isc__mem_free((isc_mem_t *)ctx, ptr FLARG_PASS);
MCTXLOCK(ctx, &ctx->lock);
ctx->references--;
if (ctx->references == 0)
want_destroy = true;
MCTXUNLOCK(ctx, &ctx->lock);
if (want_destroy)
isc_refcount_decrement(&ctx->references, &refs);
if (refs == 0) {
destroy(ctx);
}
return;
}
@@ -1188,21 +1182,19 @@ isc___mem_putanddetach(isc_mem_t **ctxp, void *ptr, size_t size FLARG) {
mem_putstats(ctx, ptr, size);
mem_put(ctx, ptr, size);
}
INSIST(ctx->references > 0);
ctx->references--;
if (ctx->references == 0)
want_destroy = true;
MCTXUNLOCK(ctx, &ctx->lock);
if (want_destroy)
isc_refcount_decrement(&ctx->references, &refs);
if (refs == 0) {
destroy(ctx);
}
}
void
isc__mem_destroy(isc_mem_t **ctxp) {
isc__mem_t *ctx;
int_fast32_t refs;
/*
* This routine provides legacy support for callers who use mctxs
@@ -1213,15 +1205,13 @@ isc__mem_destroy(isc_mem_t **ctxp) {
ctx = (isc__mem_t *)*ctxp;
REQUIRE(VALID_CONTEXT(ctx));
MCTXLOCK(ctx, &ctx->lock);
isc_refcount_decrement(&ctx->references, &refs);
#if ISC_MEM_TRACKLINES
if (ctx->references != 1)
if (refs >= 1) {
print_active(ctx, stderr);
}
#endif
REQUIRE(ctx->references == 1);
ctx->references--;
MCTXUNLOCK(ctx, &ctx->lock);
isc_refcount_destroy(&ctx->references);
destroy(ctx);
*ctxp = NULL;
@@ -2270,10 +2260,10 @@ print_contexts(FILE *file) {
ctx != NULL;
ctx = ISC_LIST_NEXT(ctx, link))
{
fprintf(file, "context: %p (%s): %u references\n",
fprintf(file, "context: %p (%s): %" PRIdFAST32 " references\n",
ctx,
ctx->name[0] == 0 ? "<unknown>" : ctx->name,
ctx->references);
isc_refcount_current(&ctx->references));
print_active(ctx, file);
}
fflush(file);
@@ -2315,15 +2305,7 @@ isc_mem_checkdestroyed(FILE *file) {
unsigned int
isc_mem_references(isc_mem_t *ctx0) {
isc__mem_t *ctx = (isc__mem_t *)ctx0;
unsigned int references;
REQUIRE(VALID_CONTEXT(ctx));
MCTXLOCK(ctx, &ctx->lock);
references = ctx->references;
MCTXUNLOCK(ctx, &ctx->lock);
return (references);
return (isc_refcount_current(&ctx->references));
}
typedef struct summarystat {
@@ -2370,7 +2352,8 @@ xml_renderctx(isc__mem_t *ctx, summarystat_t *summary,
}
#endif
TRY0(xmlTextWriterStartElement(writer, ISC_XMLCHAR "references"));
TRY0(xmlTextWriterWriteFormatString(writer, "%d", ctx->references));
TRY0(xmlTextWriterWriteFormatString(writer, "%" PRIdFAST32,
isc_refcount_current(&ctx->references)));
TRY0(xmlTextWriterEndElement(writer)); /* references */
summary->total += ctx->total;
@@ -2570,7 +2553,7 @@ json_renderctx(isc__mem_t *ctx, summarystat_t *summary, json_object *array) {
json_object_object_add(ctxobj, "name", obj);
}
obj = json_object_new_int64(ctx->references);
obj = json_object_new_int64(isc_refcount_current(&ctx->references));
CHECKMEM(obj);
json_object_object_add(ctxobj, "references", obj);