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Side by Side Diff: third_party/tcmalloc/vendor/src/base/spinlock_linux-inl.h

Issue 9316021: Update the tcmalloc vendor branch to r144 (gperftools 2.0). (Closed) Base URL: http://git.chromium.org/git/chromium.git@trunk
Patch Set: Reuploading Created 8 years, 9 months ago
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1 /* Copyright (c) 2009, Google Inc. 1 /* Copyright (c) 2009, Google Inc.
2 * All rights reserved. 2 * All rights reserved.
3 * 3 *
4 * Redistribution and use in source and binary forms, with or without 4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are 5 * modification, are permitted provided that the following conditions are
6 * met: 6 * met:
7 * 7 *
8 * * Redistributions of source code must retain the above copyright 8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer. 9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above 10 * * Redistributions in binary form must reproduce the above
(...skipping 13 matching lines...) Expand all
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 * 29 *
30 * --- 30 * ---
31 * This file is a Linux-specific part of spinlock_internal.cc 31 * This file is a Linux-specific part of spinlock_internal.cc
32 */ 32 */
33 33
34 #include <errno.h>
34 #include <sched.h> 35 #include <sched.h>
35 #include <time.h> 36 #include <time.h>
36 #include <limits.h> 37 #include <limits.h>
37 #include "base/linux_syscall_support.h" 38 #include "base/linux_syscall_support.h"
38 39
39 #define FUTEX_WAIT 0 40 #define FUTEX_WAIT 0
40 #define FUTEX_WAKE 1 41 #define FUTEX_WAKE 1
41 #define FUTEX_PRIVATE_FLAG 128 42 #define FUTEX_PRIVATE_FLAG 128
42 43
43 static bool have_futex; 44 static bool have_futex;
(...skipping 24 matching lines...) Expand all
68 69
69 namespace base { 70 namespace base {
70 namespace internal { 71 namespace internal {
71 72
72 void SpinLockDelay(volatile Atomic32 *w, int32 value, int loop) { 73 void SpinLockDelay(volatile Atomic32 *w, int32 value, int loop) {
73 if (loop != 0) { 74 if (loop != 0) {
74 int save_errno = errno; 75 int save_errno = errno;
75 struct timespec tm; 76 struct timespec tm;
76 tm.tv_sec = 0; 77 tm.tv_sec = 0;
77 if (have_futex) { 78 if (have_futex) {
78 tm.tv_nsec = 1000000; // 1ms; really we're trying to sleep for one 79 tm.tv_nsec = base::internal::SuggestedDelayNS(loop);
79 // kernel clock tick
80 } else { 80 } else {
81 tm.tv_nsec = 2000001; // above 2ms so linux 2.4 doesn't spin 81 tm.tv_nsec = 2000001; // above 2ms so linux 2.4 doesn't spin
82 } 82 }
83 if (have_futex) { 83 if (have_futex) {
84 tm.tv_nsec *= 16; // increase the delay; we expect explicit wakeups
84 sys_futex(reinterpret_cast<int *>(const_cast<Atomic32 *>(w)), 85 sys_futex(reinterpret_cast<int *>(const_cast<Atomic32 *>(w)),
85 FUTEX_WAIT | futex_private_flag, 86 FUTEX_WAIT | futex_private_flag,
86 value, reinterpret_cast<struct kernel_timespec *>(&tm)); 87 value, reinterpret_cast<struct kernel_timespec *>(&tm));
87 } else { 88 } else {
88 nanosleep(&tm, NULL); 89 nanosleep(&tm, NULL);
89 } 90 }
90 errno = save_errno; 91 errno = save_errno;
91 } 92 }
92 } 93 }
93 94
94 void SpinLockWake(volatile Atomic32 *w, bool all) { 95 void SpinLockWake(volatile Atomic32 *w, bool all) {
95 if (have_futex) { 96 if (have_futex) {
96 sys_futex(reinterpret_cast<int *>(const_cast<Atomic32 *>(w)), 97 sys_futex(reinterpret_cast<int *>(const_cast<Atomic32 *>(w)),
97 FUTEX_WAKE | futex_private_flag, all? INT_MAX : 1, 0); 98 FUTEX_WAKE | futex_private_flag, all? INT_MAX : 1, 0);
98 } 99 }
99 } 100 }
100 101
101 } // namespace internal 102 } // namespace internal
102 } // namespace base 103 } // namespace base
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