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change control of threadLimit

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now limits maximum nb of active threads
even when queueSize > 1.
This commit is contained in:
Yann Collet 2018-06-20 14:35:39 -07:00
parent 62469c9f41
commit 6b48eb12c0
1 changed files with 11 additions and 10 deletions
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21
lib/common/pool.c
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@ -10,9 +10,10 @@
/* ====== Dependencies ======= */
#include <stddef.h> /* size_t */
#include "pool.h"
#include <stddef.h> /* size_t */
#include "debug.h" /* assert */
#include "zstd_internal.h" /* ZSTD_malloc, ZSTD_free */
#include "pool.h"
/* ====== Compiler specifics ====== */
#if defined(_MSC_VER)
@ -70,14 +71,14 @@ static void* POOL_thread(void* opaque) {
/* Lock the mutex and wait for a non-empty queue or until shutdown */
ZSTD_pthread_mutex_lock(&ctx->queueMutex);
while (ctx->queueEmpty && !ctx->shutdown) {
while ( ctx->queueEmpty
|| (ctx->numThreadsBusy >= ctx->threadLimit) ) {
if (ctx->shutdown) {
ZSTD_pthread_mutex_unlock(&ctx->queueMutex);
return opaque;
}
ZSTD_pthread_cond_wait(&ctx->queuePopCond, &ctx->queueMutex);
}
/* empty => shutting down: so stop */
if (ctx->queueEmpty) {
ZSTD_pthread_mutex_unlock(&ctx->queueMutex);
return opaque;
}
/* Pop a job off the queue */
{ POOL_job const job = ctx->queue[ctx->queueHead];
ctx->queueHead = (ctx->queueHead + 1) % ctx->queueSize;
@ -97,7 +98,7 @@ static void* POOL_thread(void* opaque) {
ZSTD_pthread_cond_signal(&ctx->queuePushCond);
} }
} /* for (;;) */
/* Unreachable */
assert(0); /* Unreachable */
}
POOL_ctx* POOL_create(size_t numThreads, size_t queueSize) {
@ -237,7 +238,7 @@ static int isQueueFull(POOL_ctx const* ctx) {
if (ctx->queueSize > 1) {
return ctx->queueHead == ((ctx->queueTail + 1) % ctx->queueSize);
} else {
return ctx->numThreadsBusy == ctx->threadLimit ||
return (ctx->numThreadsBusy == ctx->threadLimit) ||
!ctx->queueEmpty;
}
}