Diff: events/equeue/equeue_posix.c

Revision:

0:f782d9c66c49

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/events/equeue/equeue_posix.c	Fri Feb 02 05:42:23 2018 +0000
@@ -0,0 +1,106 @@
+/*
+ * Implementation for Posix compliant platforms
+ *
+ * Copyright (c) 2016 Christopher Haster
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "equeue/equeue_platform.h"
+
+#if defined(EQUEUE_PLATFORM_POSIX)
+
+#include <time.h>
+#include <sys/time.h>
+#include <errno.h>
+
+
+// Tick operations
+unsigned equeue_tick(void) {
+    struct timeval tv;
+    gettimeofday(&tv, 0);
+    return (unsigned)(tv.tv_sec*1000 + tv.tv_usec/1000);
+}
+
+
+// Mutex operations
+int equeue_mutex_create(equeue_mutex_t *m) {
+    return pthread_mutex_init(m, 0);
+}
+
+void equeue_mutex_destroy(equeue_mutex_t *m) {
+    pthread_mutex_destroy(m);
+}
+
+void equeue_mutex_lock(equeue_mutex_t *m) {
+    pthread_mutex_lock(m);
+}
+
+void equeue_mutex_unlock(equeue_mutex_t *m) {
+    pthread_mutex_unlock(m);
+}
+
+
+// Semaphore operations
+int equeue_sema_create(equeue_sema_t *s) {
+    int err = pthread_mutex_init(&s->mutex, 0);
+    if (err) {
+        return err;
+    }
+
+    err = pthread_cond_init(&s->cond, 0);
+    if (err) {
+        return err;
+    }
+
+    s->signal = false;
+    return 0;
+}
+
+void equeue_sema_destroy(equeue_sema_t *s) {
+    pthread_cond_destroy(&s->cond);
+    pthread_mutex_destroy(&s->mutex);
+}
+
+void equeue_sema_signal(equeue_sema_t *s) {
+    pthread_mutex_lock(&s->mutex);
+    s->signal = true;
+    pthread_cond_signal(&s->cond);
+    pthread_mutex_unlock(&s->mutex);
+}
+
+bool equeue_sema_wait(equeue_sema_t *s, int ms) {
+    pthread_mutex_lock(&s->mutex);
+    if (!s->signal) {
+        if (ms < 0) {
+            pthread_cond_wait(&s->cond, &s->mutex);
+        } else {
+            struct timeval tv;
+            gettimeofday(&tv, 0);
+
+            struct timespec ts = {
+                .tv_sec = ms/1000 + tv.tv_sec,
+                .tv_nsec = ms*1000000 + tv.tv_usec*1000,
+            };
+
+            pthread_cond_timedwait(&s->cond, &s->mutex, &ts);
+        }
+    }
+
+    bool signal = s->signal;
+    s->signal = false;
+    pthread_mutex_unlock(&s->mutex);
+
+    return signal;
+}
+
+#endif