More robust platform definition support.

The idea is that someday it will be possible to just concatenate the entire
set of source files into a single giant source file, for systems that
want to work this way.  As a result, the build system now compiles every
file, although some of them will not have any definitions.

1 files changed, 243 insertions, 0 deletions

diff --git a/src/platform/posix/posix_synch.c b/src/platform/posix/posix_synch.c
new file mode 100644
index 00000000..cb8b30dd
--- /dev/null
+++ b/src/platform/posix/posix_synch.c
@@ -0,0 +1,243 @@
+/*
+ * 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).  This uses
+ * pthreads.
+ */
+
+#include "core/nng_impl.h"
+
+#ifdef PLATFORM_POSIX_SYNCH
+
+#include <pthread.h>
+#include <time.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");
+	}
+	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
+cond_attr(pthread_condattr_t **attrpp)
+{
+#if defined(NNG_USE_GETTIMEOFDAY) || NNG_USE_CLOCKID == CLOCK_REALTIME
+	*attrpp = NULL;
+	return (0);
+#else
+	/* In order to make this fast, avoid reinitializing attrs. */
+	static pthread_condattr_t attr;
+	static pthread_mutex_t mx = PTHREAD_MUTEX_INITIALIZER;
+	static int init = 0;
+	int rv;
+
+	/*
+	 * For efficiency's sake, we try to reuse the same attr for the
+	 * life of the library.  This avoids many reallocations.  Technically
+	 * this means that we will leak the attr on exit(), but this is
+	 * preferable to constantly allocating and reallocating it.
+	 */
+	if (init) {
+		*attrpp = &attr;
+		return (0);
+	}
+
+	(void) pthread_mutex_lock(&mx);
+	while (!init) {
+		if ((rv = pthread_condattr_init(&attr)) != 0) {
+			(void) pthread_mutex_unlock(&mx);
+			return (NNG_ENOMEM);
+		}
+		rv = pthread_condattr_setclock(&attr, NNG_USE_CLOCKID);
+		if (rv != 0) {
+			nni_panic("condattr_setclock: %s", strerror(rv));
+		}
+		init = 1;
+	}
+	(void) pthread_mutex_unlock(&mx);
+	*attrpp = &attr;
+	return (0);
+#endif
+}
+
+int
+nni_cond_create(nni_cond_t *cvp, nni_mutex_t mx)
+{
+	/*
+	 * By preference, we use a CLOCK_MONOTONIC version of condition
+	 * variables, which insulates us from changes to the system time.
+	 */
+	struct nni_cond *c;
+	pthread_condattr_t *attrp;
+	int rv;
+
+	if ((rv = cond_attr(&attrp)) != 0) {
+		return (rv);
+	}
+	if ((c = nni_alloc(sizeof (*c))) == NULL) {
+		return (NNG_ENOMEM);
+	}
+	c->mx = &mx->mx;
+	if (pthread_cond_init(&c->cv, attrp) != 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));
+}
+
+void
+nni_cond_signal(nni_cond_t c)
+{
+	if (pthread_cond_signal(&c->cv) != 0) {
+		nni_panic("pthread_cond_signal failed");
+	}
+}
+
+void
+nni_cond_broadcast(nni_cond_t c)
+{
+	if (pthread_cond_broadcast(&c->cv) != 0) {
+		nni_panic("pthread_cond_broadcast failed");
+	}
+}
+
+void
+nni_cond_wait(nni_cond_t c)
+{
+	if (pthread_cond_wait(&c->cv, c->mx) != 0) {
+		nni_panic("pthread_cond_wait failed");
+	}
+}
+
+int
+nni_cond_timedwait(nni_cond_t c, uint64_t usec)
+{
+	struct timespec ts;
+	int rv;
+
+	usec += nni_clock();
+
+	ts.tv_sec = usec / 1000000;
+	ts.tv_nsec = (usec % 10000) * 1000;
+
+	rv = pthread_cond_timedwait(&c->cv, c->mx, &ts);
+
+	if (rv == ETIMEDOUT) {
+		return (NNG_ETIMEDOUT);
+	} else if (rv != 0) {
+		nni_panic("pthread_cond_timedwait returned %d", rv);
+	}
+	return (0);
+}
+
+#endif
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