--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/server/thrpool.c Tue Sep 06 22:27:32 2011 +0200
@@ -0,0 +1,122 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2011 Olaf Wintermann. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "thrpool.h"
+
+
+
+threadpool_t* threadpool_new(int n) {
+ threadpool_t *pool = malloc(sizeof(threadpool_t));
+ pool->queue = NULL;
+ pool->queue_len = 0;
+
+ pthread_mutex_init(&pool->queue_lock, NULL);
+ pthread_mutex_init(&pool->avlbl_lock, NULL);
+ pthread_cond_init(&pool->available, NULL);
+
+ /* create pool threads */
+ for(int i=0;i<n;i++) {
+ pthread_t t;
+ if (pthread_create(&t, NULL, threadpool_func, pool) != 0) {
+ perror("Error: threadpool_new: pthread_create");
+ return NULL;
+ }
+ }
+
+ return pool;
+}
+
+void* threadpool_func(void *data) {
+ threadpool_t *pool = (threadpool_t*)data;
+
+ for(;;) {
+ threadpool_job *job = threadpool_get_job(pool);
+ if(job == NULL) {
+ break;
+ }
+
+ job->callback(job->data);
+
+ free(job);
+ }
+ return NULL;
+}
+
+threadpool_job* threadpool_get_job(threadpool_t *pool) {
+ pthread_mutex_lock(&pool->queue_lock);
+
+ threadpool_job *job = NULL;
+ while(job == NULL) {
+ if(pool->queue_len == 0) {
+ pthread_cond_wait(&pool->available, &pool->queue_lock);
+ continue;
+ } else {
+ pool_queue_t *q = pool->queue;
+ job = q->job;
+ pool->queue = q->next;
+ pool->queue_len--;
+ free(q);
+ }
+ }
+
+ pthread_mutex_unlock(&pool->queue_lock);
+
+ return job;
+}
+
+void threadpool_run(threadpool_t *pool, job_callback_f func, void *data) {
+ threadpool_job *job = malloc(sizeof(threadpool_job));
+ job->callback = func;
+ job->data = data;
+
+ pool_queue_t *q = malloc(sizeof(pool_queue_t));
+ q->job = job;
+ q->next = NULL;
+
+ pthread_mutex_lock(&pool->queue_lock);
+ if(pool->queue == NULL) {
+ pool->queue = q;
+ } else {
+ pool_queue_t *last_elem = pool->queue;
+ while(last_elem->next != NULL) {
+ last_elem = last_elem->next;
+ }
+ last_elem->next = q;
+ }
+ pool->queue_len++;
+
+ if(pool->queue_len == 1) {
+ pthread_cond_signal(&pool->available);
+ }
+
+ pthread_mutex_unlock(&pool->queue_lock);
+
+}