Use private futexes for pthread_mutex_t.

This does not change the implementation of conditional variables
since we're waiting for other system components to properly use
pthread_condattr_init/setpshared before that.

Also remove an obsolete x86 source file.

Change-Id: Ia3e3fbac35b87a534fb04d4381c3c66b975bc8f7

2 files changed, 32 insertions, 104 deletions

diff --git a/libc/arch-x86/bionic/atomics_x86.S b/libc/arch-x86/bionic/atomics_x86.S
index 2370f23..666e182 100644
--- a/libc/arch-x86/bionic/atomics_x86.S
+++ b/libc/arch-x86/bionic/atomics_x86.S
@@ -41,6 +41,38 @@ __futex_wake:
     popl    %ebx
     ret
 
+/* int __futex_syscall3(volatile void *ftx, int op, int count) */
+.text
+.globl __futex_syscall3
+.type __futex_syscall3, @function
+.align 4
+__futex_syscall3:
+    pushl   %ebx
+    movl    8(%esp), %ebx      /* ftx */
+    movl    12(%esp), %ecx      /* op */
+    movl    16(%esp), %edx      /* value */
+    movl    $__NR_futex, %eax
+    int     $0x80
+    popl    %ebx
+    ret
+
+/* int __futex_syscall4(volatile void *ftx, int op, int val, const struct timespec *timeout) */
+.text
+.globl __futex_syscall4
+.type __futex_syscall4, @function
+.align 4
+__futex_syscall4:
+    pushl   %ebx
+    pushl   %esi
+    movl    12(%esp), %ebx      /* ftx */
+    movl    16(%esp), %ecx      /* op */
+    movl    20(%esp), %edx      /* val */
+    movl    24(%esp), %esi      /* timeout */
+    movl    $__NR_futex, %eax
+    int     $0x80
+    popl    %esi
+    popl    %ebx
+    ret
 
 /* int __atomic_cmpxchg(int old, int new, volatile int* addr) */
 
diff --git a/libc/arch-x86/bionic/atomics_x86.c b/libc/arch-x86/bionic/atomics_x86.c
deleted file mode 100644
index b7b20e6..0000000
--- a/libc/arch-x86/bionic/atomics_x86.c
+++ /dev/null
@@ -1,104 +0,0 @@
-/*
- * Copyright (C) 2008 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *  * Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *  * Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-#include <sys/atomics.h>
-
-#define FUTEX_SYSCALL 240
-#define FUTEX_WAIT 0
-#define FUTEX_WAKE 1
-
-int __futex_wait(volatile void *ftx, int val)
-{
-    int ret;
-    asm volatile (
-        "int $0x80;"
-        : "=a" (ret)
-        : "0" (FUTEX_SYSCALL),
-          "b" (ftx),
-          "c" (FUTEX_WAIT),
-          "d" (val),
-          "S" (0)
-    );
-    return ret;
-}
-
-int __futex_wake(volatile void *ftx, int count)
-{
-    int ret;
-    asm volatile (
-        "int $0x80;"
-        : "=a" (ret)
-        : "0" (FUTEX_SYSCALL),
-          "b" (ftx),
-          "c" (FUTEX_WAKE),
-          "d" (count)
-    );
-    return ret;
-}
-
-int __atomic_cmpxchg(int old, int new, volatile int* addr) {
-    int xchg;
-    asm volatile (
-        "lock;"
-        "cmpxchg %%ecx, (%%edx);"
-        "setne %%al;"
-        : "=a" (xchg)
-        : "a" (old),
-          "c" (new),
-          "d" (addr)
-    );
-    return xchg;
-}
-
-int __atomic_swap(int new, volatile int* addr) {
-    int old;
-    asm volatile (
-        "lock;"
-        "xchg %%ecx, (%%edx);"
-        : "=c" (old)
-        : "c" (new),
-          "d" (addr)
-    );
-    return old;
-}
-
-int __atomic_dec(volatile int* addr) {
-    int old;
-    do {
-        old = *addr;
-    } while (atomic_cmpxchg(old, old-1, addr));
-    return old;
-}
-
-int __atomic_inc(volatile int* addr) {
-    int old;
-    do {
-        old = *addr;
-    } while (atomic_cmpxchg(old, old+1, addr));
-    return old;
-}
-