d6cdf9b877
The methodology used to generate this CL is documented in https://crbug.com/1098010#c95. No-Try: true No-Presubmit: true Bug: 1098010 Change-Id: Ia865422057bdda8d25f347a651636f6f7f4d4278 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3900694 Owners-Override: Avi Drissman <avi@chromium.org> Commit-Queue: Avi Drissman <avi@chromium.org> Reviewed-by: Mark Mentovai <mark@chromium.org> Auto-Submit: Avi Drissman <avi@chromium.org> Cr-Commit-Position: refs/heads/main@{#1047637}
46 lines
1.5 KiB
C++
46 lines
1.5 KiB
C++
// Copyright 2012 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef RLZ_LIB_RECURSIVE_CROSS_PROCESS_LOCK_POSIX_H_
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#define RLZ_LIB_RECURSIVE_CROSS_PROCESS_LOCK_POSIX_H_
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#include <pthread.h>
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namespace base {
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class FilePath;
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}
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namespace rlz_lib {
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// Creating a recursive cross-process mutex on Windows is one line. On POSIX,
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// there's no primitive for that, so this lock is emulated by an in-process
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// mutex to get the recursive part, followed by a cross-process lock for the
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// cross-process part.
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// This is a struct so that it doesn't need a static initializer.
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struct RecursiveCrossProcessLock {
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// Tries to acquire a recursive cross-process lock. Note that this _always_
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// acquires the in-process lock (if it wasn't already acquired). The parent
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// directory of |lock_file| must exist.
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bool TryGetCrossProcessLock(const base::FilePath& lock_filename);
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// Releases the lock. Should always be called, even if
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// TryGetCrossProcessLock() returned |false|.
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void ReleaseLock();
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pthread_mutex_t recursive_lock_;
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pthread_t locking_thread_;
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int file_lock_;
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};
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// On Mac, PTHREAD_RECURSIVE_MUTEX_INITIALIZER doesn't exist before 10.7 and
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// is buggy on 10.7 (http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51906#c34),
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// so emulate recursive locking with a normal non-recursive mutex.
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#define RECURSIVE_CROSS_PROCESS_LOCK_INITIALIZER \
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{ PTHREAD_MUTEX_INITIALIZER, 0, -1 }
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} // namespace rlz_lib
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#endif // RLZ_LIB_RECURSIVE_CROSS_PROCESS_LOCK_POSIX_H_
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