1 files changed, 39 insertions, 0 deletions
diff --git a/src/thread/pthread_self.c b/src/thread/pthread_self.c
new file mode 100644
index 0000000..686d73d
--- /dev/null
+++ b/src/thread/pthread_self.c
@@ -0,0 +1,39 @@
+#include "pthread_impl.h"
+
+static struct pthread main_thread;
+
+#undef errno
+static int *errno_location()
+{
+	return pthread_self()->errno_ptr;
+}
+
+static int init_main_thread()
+{
+	main_thread.tlsdesc[0] = -1;
+	main_thread.tlsdesc[1] = (long)&main_thread;
+	main_thread.tlsdesc[2] = SIZE_MAX/PAGE_SIZE;
+	main_thread.tlsdesc[3] = 0x51;
+	main_thread.self = &main_thread;
+	main_thread.errno_ptr = __errno_location();
+	if (__set_thread_area(main_thread.tlsdesc) < 0)
+		return -1;
+	syscall1(__NR_set_tid_address, (long)&main_thread.tid);
+	libc.errno_location = errno_location;
+	main_thread.tid = main_thread.pid = getpid();
+	return 0;
+}
+
+#undef pthread_self
+
+pthread_t pthread_self()
+{
+	static int init, failed;
+	if (!init) {
+		if (failed) return 0;
+		if (init_main_thread() < 0) failed = 1;
+		if (failed) return 0;
+		init = 1;
+	}
+	return __pthread_self();
+}