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/*
*
* Copyright 2015, Google Inc.
* 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* 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.
*
*/
#ifndef GRPCXX_IMPL_SYNC_NO_CXX11_H
#define GRPCXX_IMPL_SYNC_NO_CXX11_H
#include <grpc/support/sync.h>
namespace grpc {
template<class mutex>
class lock_guard;
class condition_variable;
class mutex {
public:
mutex() { gpr_mu_init(&mu_); }
~mutex() { gpr_mu_destroy(&mu_); }
private:
::gpr_mu mu_;
template <class mutex>
friend class lock_guard;
friend class condition_variable;
};
template <class mutex>
class lock_guard {
public:
lock_guard(mutex &mu) : mu_(mu), locked(true) { gpr_mu_lock(&mu.mu_); }
~lock_guard() { unlock_internal(); }
protected:
void lock_internal() {
if (!locked) gpr_mu_lock(&mu_.mu_);
locked = true;
}
void unlock_internal() {
if (locked) gpr_mu_unlock(&mu_.mu_);
locked = false;
}
private:
mutex &mu_;
bool locked;
friend class condition_variable;
};
template <class mutex>
class unique_lock : public lock_guard<mutex> {
public:
unique_lock(mutex &mu) : lock_guard(mu) { }
void lock() { lock_internal(); }
void unlock() { unlock_internal(); }
};
class condition_variable {
public:
condition_variable() { gpr_cv_init(&cv_); }
~condition_variable() { gpr_cv_destroy(&cv_); }
void wait(lock_guard<mutex> &mu) {
mu.locked = false;
gpr_cv_wait(&cv_, &mu.mu_.mu_, gpr_inf_future);
mu.locked = true;
}
void notify_one() { gpr_cv_signal(&cv_); }
void notify_all() { gpr_cv_broadcast(&cv_); }
private:
gpr_cv cv_;
};
} // namespace grpc
#endif // GRPCXX_IMPL_SYNC_NO_CXX11_H
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