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https://github.com/wpilibsuite/allwpilib
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c0ecde302f
If a lock is used with a mutex that doesn't need to be unlocked again before the lock is destroyed, std::lock_guard can be more efficient than std::unique_lock due to less overhead. This commit also removes a redundant set of curly braces in PIDController.cpp intended to constrain a lock's scope. Change-Id: Idd692ce439528ddb319a4c62c40c7351a664eb97
35 lines
928 B
C++
35 lines
928 B
C++
/*----------------------------------------------------------------------------*/
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/* Copyright (c) FIRST 2015. All Rights Reserved. */
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/* Open Source Software - may be modified and shared by FRC teams. The code */
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/* must be accompanied by the FIRST BSD license file in $(WIND_BASE)/WPILib. */
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/*----------------------------------------------------------------------------*/
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#include "HAL/cpp/Semaphore.hpp"
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Semaphore::Semaphore(uint32_t count) {
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m_count = count;
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}
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void Semaphore::give() {
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std::lock_guard<priority_mutex> lock(m_mutex);
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++m_count;
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m_condition.notify_one();
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}
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void Semaphore::take() {
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std::unique_lock<priority_mutex> lock(m_mutex);
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m_condition.wait(lock, [this] { return m_count; } );
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--m_count;
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}
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bool Semaphore::tryTake() {
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std::lock_guard<priority_mutex> lock(m_mutex);
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if (m_count) {
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--m_count;
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return true;
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}
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else {
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return false;
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}
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}
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