3 * Copyright 2011, Google Inc.
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6 * modification, are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
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11 * this list of conditions and the following disclaimer in the documentation
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28 #include "talk/base/sharedexclusivelock.h"
32 SharedExclusiveLock::SharedExclusiveLock()
33 : shared_count_is_zero_(true, true),
37 void SharedExclusiveLock::LockExclusive() {
38 cs_exclusive_.Enter();
39 shared_count_is_zero_.Wait(talk_base::kForever);
42 void SharedExclusiveLock::UnlockExclusive() {
43 cs_exclusive_.Leave();
46 void SharedExclusiveLock::LockShared() {
47 CritScope exclusive_scope(&cs_exclusive_);
48 CritScope shared_scope(&cs_shared_);
49 if (++shared_count_ == 1) {
50 shared_count_is_zero_.Reset();
54 void SharedExclusiveLock::UnlockShared() {
55 CritScope shared_scope(&cs_shared_);
56 if (--shared_count_ == 0) {
57 shared_count_is_zero_.Set();
61 } // namespace talk_base