From 34c637960a2ecd204f8809d223f87f69ab776036 Mon Sep 17 00:00:00 2001
From: Ali Mashtizadeh <mashti@cs.stanford.edu>
Date: Fri, 16 Jan 2015 20:15:47 -0800
Subject: [PATCH] Begin implementing basic pthread functionality.

---
 include/pthread.h        | 49 ++++++++++++++++++++
 lib/libc/SConscript      |  1 +
 lib/libc/posix/pthread.c | 98 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 148 insertions(+)
 create mode 100644 include/pthread.h
 create mode 100644 lib/libc/posix/pthread.c

diff --git a/include/pthread.h b/include/pthread.h
new file mode 100644
index 0000000..29e0bdf
--- /dev/null
+++ b/include/pthread.h
@@ -0,0 +1,49 @@
+
+#ifndef __PTHREAD_H__
+#define __PTHREAD_H__
+
+typedef uint64_t pthread_t;
+typedef uint64_t pthread_attr_t;
+typedef uint64_t pthread_barrier_t;
+typedef uint64_t pthread_barrierattr_t;
+typedef uint64_t pthread_mutex_t;
+typedef uint64_t pthread_mutexattr_t;
+
+pthread_t pthread_self(void);
+int pthread_create(pthread_t *thread, const pthread_attr_t *attr,
+		   void *(*start_routine)(void *), void *arg);
+void pthread_exit(void *value_ptr);
+int pthread_join(pthread_t thread, void **value_ptr);
+void pthread_yield(void);
+
+/*
+ * Barriers
+ */
+
+int pthread_barrier_init(pthread_barrier_t *barrier,
+			 const pthread_barrierattr_t *attr,
+			 unsigned count);
+int pthread_barrier_destroy(pthread_barrier_t *barrier);
+int pthread_barrier_wait(pthread_barrier_t *barrier);
+
+/*
+ * Mutex
+ */
+
+int pthread_mutex_init(pthread_mutex_t *mutex,
+		       const pthread_mutexattr_t *attr);
+int pthread_mutex_destroy(pthread_mutex_t *mutex);
+int pthread_mutex_lock(pthread_mutex_t *mutex);
+int pthread_mutex_trylock(pthread_mutex_t *mutex);
+int pthread_mutex_unlock(pthread_mutex_t *mutex);
+
+/*
+ * Reader/Writer Lock
+ */
+
+/*
+ * Condition Variables
+ */
+
+#endif /* __PTHREAD_H__ */
+
diff --git a/lib/libc/SConscript b/lib/libc/SConscript
index 4d44201..768eef0 100644
--- a/lib/libc/SConscript
+++ b/lib/libc/SConscript
@@ -16,6 +16,7 @@ src_common = [
     "printf.c",
     "process.c",
     "posix/mman.c",
+    "posix/pthread.c",
     "string.c",
     "syscall.c",
     "time.c",
diff --git a/lib/libc/posix/pthread.c b/lib/libc/posix/pthread.c
new file mode 100644
index 0000000..a32af77
--- /dev/null
+++ b/lib/libc/posix/pthread.c
@@ -0,0 +1,98 @@
+
+#include <stdint.h>
+
+#include <unistd.h>
+#include <pthread.h>
+
+#include <syscall.h>
+
+pthread_t
+pthread_self(void)
+{
+}
+
+int
+pthread_create(pthread_t *thread, const pthread_attr_t *attr,
+	       void *(*start_routine)(void *), void *arg)
+{
+}
+
+void
+pthread_exit(void *value_ptr)
+{
+    OSThreadExit(value_ptr);
+}
+
+int
+pthread_join(pthread_t thread, void **value_ptr)
+{
+    uint64_t value = OSThreadWait(thread);
+
+    *value_ptr = (void *)value;
+}
+
+void
+pthread_yield(void)
+{
+    OSThreadSleep(0);
+}
+
+/*
+ * Barriers
+ */
+
+int
+pthread_barrier_init(pthread_barrier_t *barrier,
+		     const pthread_barrierattr_t *attr,
+		     unsigned count)
+{
+}
+
+int
+pthread_barrier_destroy(pthread_barrier_t *barrier)
+{
+}
+
+int
+pthread_barrier_wait(pthread_barrier_t *barrier)
+{
+}
+
+/*
+ * Mutex
+ */
+
+int
+pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
+{
+}
+
+int
+pthread_mutex_destroy(pthread_mutex_t *mutex)
+{
+}
+
+int
+pthread_mutex_lock(pthread_mutex_t *mutex)
+{
+}
+
+int
+pthread_mutex_trylock(pthread_mutex_t *mutex)
+{
+}
+
+int
+pthread_mutex_unlock(pthread_mutex_t *mutex)
+{
+}
+
+
+/*
+ * Reader/Writer Lock
+ */
+
+/*
+ * Condition Variables
+ */
+