crashpad::Semaphore Class Reference

An anonymous in-process counting sempahore. More...

#include "util/synchronization/semaphore.h"

Public Member Functions
	Semaphore (int value)
	Initializes the semaphore. More...
void	Wait ()
	Performs the wait (or “procure”) operation on the semaphore. More...
bool	TimedWait (double seconds)
	Performs a timed wait (or “procure”) operation on the semaphore. More...
void	Signal ()
	Performs the signal (or “post”) operation on the semaphore. More...

Static Public Attributes
static constexpr double	kIndefiniteWait
	A TimedWait() argument that causes an indefinite wait. More...

Detailed Description

An anonymous in-process counting sempahore.

Constructor & Destructor Documentation

Semaphore()

crashpad::Semaphore::Semaphore ( int  value )

explicit

Initializes the semaphore.

Parameters

[in]

value

The initial value of the semaphore.

If the semaphore cannot be created, execution is terminated.

Member Function Documentation

Signal()

void crashpad::Semaphore::Signal

(

)

Performs the signal (or “post”) operation on the semaphore.

Atomically increments the value of the semaphore by 1. If the new value is 0, a caller blocked in Wait() will be awakened.

TimedWait()

bool crashpad::Semaphore::TimedWait

(

double

seconds

)

Performs a timed wait (or “procure”) operation on the semaphore.

Parameters

[in]

seconds

The maximum number of seconds to wait for the operation to complete. If seconds is kIndefiniteWait, this method behaves as Wait(), and will not time out.

Returns

false if the wait timed out, true otherwise.

This method is simlar to Wait(), except that the amount of time that it blocks is limited.

Wait()

void crashpad::Semaphore::Wait

(

)

Performs the wait (or “procure”) operation on the semaphore.

Atomically decrements the value of the semaphore by 1. If the new value is negative, this function blocks and will not return until the semaphore’s value is incremented to 0 by Signal().

See also

TimedWait()

Member Data Documentation

kIndefiniteWait

constexpr double crashpad::Semaphore::kIndefiniteWait

staticconstexpr

Initial value:

=
      std::numeric_limits<double>::infinity()

A TimedWait() argument that causes an indefinite wait.

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The documentation for this class was generated from the following files:

• util/synchronization/semaphore.h
• util/synchronization/semaphore_mac.cc
• util/synchronization/semaphore_posix.cc
• util/synchronization/semaphore_win.cc