64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
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#pragma once
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#include <string>
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#include "lib_begin.h"
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namespace cgv {
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namespace os {
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/**
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*A simple mutex (mutual exclusion) for solving thread synchronisation problems.
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*/
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struct CGV_API mutex
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{
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protected:
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void* pmutex;
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public:
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///construct a mutex
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mutex();
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///destruct a mutex
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~mutex();
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/// try to lock the mutex (return false if the mutex is still locked)
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bool try_lock();
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/// lock the mutex (if the mutex is already locked, the caller is blocked until the mutex becomes available)
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void lock();
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/// unlock the mutex
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void unlock();
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/// same as lock but with printing debug information
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void debug_lock(const std::string& info);
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/// same unlock but with printing debug information
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void debug_unlock(const std::string& info);
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/// return the global locking counter that is used for mutex debugging
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static unsigned get_debug_lock_counter();
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};
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class thread;
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/**
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*A mutex that can wake up other threads by signals sent when a condition is fulfilled
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*/
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struct CGV_API condition_mutex : public mutex
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{
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protected:
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void* pcond;
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friend class thread;
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public:
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///construct a mutex
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condition_mutex();
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///destruct a mutex
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~condition_mutex();
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/// send the signal to unblock a thread waiting for the condition represented by this condition_mutex
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void send_signal();
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/// prefered approach to send the signal and implemented as {lock();send_signal();unlock();}
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void send_signal_with_lock();
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/// broadcast signal to unblock several threads waiting for the condition represented by this condition_mutex
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void broadcast_signal();
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/// prefered approach to broadcast the signal and implemented as {lock();broadcast_signal();unlock();}
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void broadcast_signal_with_lock();
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};
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}
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}
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#include <cgv/config/lib_end.h>
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