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, 130 insertions, 0 deletions

diff --git a/src/platform/posix/posix_thread.c b/src/platform/posix/posix_thread.c
new file mode 100644
index 00000000..a41c7e7c
--- /dev/null
+++ b/src/platform/posix/posix_thread.c
@@ -0,0 +1,130 @@
+/*
+ * 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 threads.
+ */
+
+#include "core/nng_impl.h"
+
+#ifdef PLATFORM_POSIX_THREAD
+
+#include <pthread.h>
+#include <time.h>
+#include <string.h>
+
+struct nni_thread {
+	pthread_t	tid;
+	void *arg;
+	void (*func)(void *);
+};
+
+static pthread_mutex_t plat_lock = PTHREAD_MUTEX_INITIALIZER;
+static int plat_init = 0;
+static int plat_fork = 0;
+
+static void *
+thrfunc(void *arg)
+{
+	nni_thread_t thr = arg;
+
+	thr->func(thr->arg);
+	return (NULL);
+}
+
+int
+nni_thread_create(nni_thread_t *tp, void (*fn)(void *), void *arg)
+{
+	nni_thread_t thr;
+	int rv;
+
+	if ((thr = nni_alloc(sizeof (*thr))) == NULL) {
+		return (NNG_ENOMEM);
+	}
+	thr->func = fn;
+	thr->arg = arg;
+
+	if ((rv = pthread_create(&thr->tid, NULL, thrfunc, thr)) != 0) {
+		nni_free(thr, sizeof (*thr));
+		return (NNG_ENOMEM);
+	}
+	*tp = thr;
+	return (0);
+}
+
+void
+nni_thread_reap(nni_thread_t thr)
+{
+	int rv;
+	if ((rv = pthread_join(thr->tid, NULL)) != 0) {
+		nni_panic("pthread_thread: %s", strerror(errno));
+	}
+	nni_free(thr, sizeof (*thr));
+}
+
+void
+atfork_child(void)
+{
+	plat_fork = 1;
+}
+
+int
+nni_plat_init(int (*helper)(void))
+{
+	int rv;
+	if (plat_fork) {
+		nni_panic("nng is fork-reentrant safe");
+	}
+	if (plat_init) {
+		return (0);	/* fast path */
+	}
+	pthread_mutex_lock(&plat_lock);
+	if (plat_init) {	/* check again under the lock to be sure */
+		pthread_mutex_unlock(&plat_lock);
+		return (0);
+	}
+	if (pthread_atfork(NULL, NULL, atfork_child) != 0) {
+		pthread_mutex_unlock(&plat_lock);
+		return (NNG_ENOMEM);
+	}
+	if ((rv = helper()) == 0) {
+		plat_init = 1;
+	}
+	pthread_mutex_unlock(&plat_lock);
+
+	return (rv);
+}
+
+void
+nni_plat_fini(void)
+{
+	/* XXX: NOTHING *YET* */
+}
+
+#endif
\ No newline at end of file