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author | lloyd <[email protected]> | 2014-01-10 03:41:59 +0000 |
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committer | lloyd <[email protected]> | 2014-01-10 03:41:59 +0000 |
commit | 6894dca64c04936d07048c0e8cbf7e25858548c3 (patch) | |
tree | 5d572bfde9fe667dab14e3f04b5285a85d8acd95 /src/lib/utils/semaphore.cpp | |
parent | 9efa3be92442afb3d0b69890a36c7f122df18eda (diff) |
Move lib into src
Diffstat (limited to 'src/lib/utils/semaphore.cpp')
-rw-r--r-- | src/lib/utils/semaphore.cpp | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/lib/utils/semaphore.cpp b/src/lib/utils/semaphore.cpp new file mode 100644 index 000000000..f4f5b2b53 --- /dev/null +++ b/src/lib/utils/semaphore.cpp @@ -0,0 +1,39 @@ +/* +* Semaphore +* by Pierre Gaston (http://p9as.blogspot.com/2012/06/c11-semaphores.html) +* modified by Joel Low for Botan +* +*/ + +#include <botan/internal/semaphore.h> + +namespace Botan { + +void Semaphore::release(size_t n) + { + for(size_t i = 0; i != n; ++i) + { + std::lock_guard<std::mutex> lock(m_mutex); + + ++m_value; + + if(m_value <= 0) + { + ++m_wakeups; + m_cond.notify_one(); + } + } + } + +void Semaphore::acquire() + { + std::unique_lock<std::mutex> lock(m_mutex); + --m_value; + if(m_value < 0) + { + m_cond.wait(lock, [this] { return m_wakeups > 0; }); + --m_wakeups; + } + } + +} |