From 1d8d9eee942ab1d2565048e00d1817147c49f48c Mon Sep 17 00:00:00 2001
From: Igor Sysoev <igor@sysoev.ru>
Date: Mon, 28 Apr 2003 15:06:39 +0000
Subject: nginx-0.0.1-2003-04-28-19:06:39 import

---
 src/os/unix/ngx_x86_mutex.h | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 src/os/unix/ngx_x86_mutex.h

(limited to 'src/os/unix/ngx_x86_mutex.h')

diff --git a/src/os/unix/ngx_x86_mutex.h b/src/os/unix/ngx_x86_mutex.h
new file mode 100644
index 000000000..a8ed2eee2
--- /dev/null
+++ b/src/os/unix/ngx_x86_mutex.h
@@ -0,0 +1,30 @@
+
+
+typedef struct {
+    int  lock;
+} ngx_mutex_t;
+
+
+static inline int ngx_spin_lock(ngx_mutex_t *m, int count)
+{
+    int  lock;
+
+    __asm__ __volatile("
+
+get_lock:
+        mov   $1, %1
+        xchg  %1, %2
+        cmp   $0, %1
+        jne   spin_lock
+
+spin_lock:
+        cmp   $0, %3
+        je    failed
+
+        dec   %3
+        rep   nop
+        cmp   $0, %2
+        jne   spin_lock
+
+    ": "=q" (lock), "m" (m->lock), "q" (count));
+}
-- 
cgit