Initial commit. This is not going to be useful to you for anything.

1 files changed, 143 insertions, 0 deletions

diff --git a/src/platform/posix/posix_synch.h b/src/platform/posix/posix_synch.h
new file mode 100644
index 00000000..4a3a152d
--- /dev/null
+++ b/src/platform/posix/posix_synch.h
@@ -0,0 +1,143 @@
+/*
+ * Copyright 2016 Garrett D'Amore <garrett@damore.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom
+ * the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/*
+ * This is more of a direct #include of a .c rather than .h file.
+ * But having it be a .h makes compiler rules work out properly.  Do
+ * not include this more than once into your program, or you will
+ * get multiple symbols defined.
+ */
+
+/*
+ * POSIX synchronization (mutexes and condition variables).
+ */
+
+#include <pthread.h>
+
+struct nni_mutex {
+	pthread_mutex_t	mx;
+};
+
+struct nni_cond {
+	pthread_cond_t	cv;
+	pthread_mutex_t	*mx;
+};
+
+int
+nni_mutex_create(nni_mutex_t *mp)
+{
+	struct nni_mutex *m;
+	pthread_mutexattr_t attr;
+	int rv;
+
+	if ((m = nni_alloc(sizeof (*m))) == NULL) {
+		return (NNG_ENOMEM);
+	}
+
+	/* We ask for more error checking... */
+	if (pthread_mutexattr_init(&attr) != 0) {
+		nni_free(m, sizeof (*m));
+		return (NNG_ENOMEM);
+	}
+
+	if (pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK) != 0) {
+		nni_panic("pthread_mutexattr_settype failed");
+	}
+
+	rv = pthread_mutex_init(&m->mx, &attr);
+
+	if (pthread_mutexattr_destroy(&attr) != 0) {
+		nni_panic("pthread_mutexattr_destroy failed");
+	}
+
+	if (rv != 0) {
+		nni_free(m, sizeof (*m));
+		return (NNG_ENOMEM);
+	}
+	*mp = m;
+	return (0);
+}
+
+void
+nni_mutex_destroy(nni_mutex_t m)
+{
+	if (pthread_mutex_destroy(&m->mx) != 0) {
+		nni_panic("pthread_mutex_destroy failed");
+	}
+	/*
+	 * If destroy fails for some reason, we can't really do
+	 * anything about it.  This would actually represent a programming
+	 * bug, and the right thing to do here would be to panic.
+	 */
+	nni_free(m, sizeof (*m));
+}
+
+void
+nni_mutex_enter(nni_mutex_t m)
+{
+	if (pthread_mutex_lock(&m->mx) != 0) {
+		nni_panic("pthread_mutex_lock failed");
+	}
+}
+
+void
+nni_mutex_exit(nni_mutex_t m)
+{
+	if (pthread_mutex_unlock(&m->mx) != 0) {
+		nni_panic("pthread_mutex_unlock failed");
+	}
+}
+
+int
+nni_mutex_tryenter(nni_mutex_t m)
+{
+	if (pthread_mutex_trylock(&m->mx) != 0) {
+		return (NNG_EBUSY);
+	}
+	return (0);
+}
+
+int
+nni_cond_create(nni_cond_t *cvp, nni_mutex_t mx)
+{
+	struct nni_cond *c;
+	if ((c = nni_alloc(sizeof (*c))) == NULL) {
+		return (NNG_ENOMEM);
+	}
+	c->mx = &mx->mx;
+	if (pthread_cond_init(&c->cv, NULL) != 0) {
+		/* In theory could be EAGAIN, but handle like ENOMEM */
+		nni_free(c, sizeof (*c));
+		return (NNG_ENOMEM);
+	}
+	*cvp = c;
+	return (0);
+}
+
+void
+nni_cond_destroy(nni_cond_t c)
+{
+	if (pthread_cond_destroy(&c->cv) != 0) {
+		nni_panic("pthread_cond_destroy failed");
+	}
+	nni_free(c, sizeof (*c));
+}