ucommon
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A portable counting semaphore class. More...
#include <thread.h>
Public Member Functions | |
unsigned | getCount (void) |
Get active semaphore limit. | |
unsigned | getUsed (void) |
Get current semaphore usage. | |
void | operator++ (void) |
Convenience operator to wait on a counting semaphore. | |
void | operator-- (void) |
Convenience operator to release a counting semaphore. | |
void | release (void) |
Release the semaphore after waiting for it. | |
semaphore (unsigned count=0) | |
Construct a semaphore with an initial count of threads to permit. | |
void | set (unsigned count) |
Alter semaphore limit at runtime. | |
bool | wait (timeout_t timeout) |
Wait until the semphore usage count is less than the thread limit. | |
void | wait (void) |
Wait until the semphore usage count is less than the thread limit. | |
Static Public Member Functions | |
static void | release (semaphore &sync) |
Convenience class to release a semaphore. | |
static void | wait (semaphore &sync) |
Convenience class to wait on a semaphore. | |
static bool | wait (semaphore &sync, timeout_t timeout) |
Convenience class to wait on a semaphore. |
A portable counting semaphore class.
A semaphore will allow threads to pass through it until the count is reached, and blocks further threads. Unlike pthread semaphore, our semaphore class supports it's count limit to be altered during runtime and the use of timed waits. This class also implements the shared_lock protocol.
unsigned semaphore::getCount | ( | void | ) |
Get active semaphore limit.
unsigned semaphore::getUsed | ( | void | ) |
Get current semaphore usage.
static void semaphore::release | ( | semaphore & | sync | ) | [inline, static] |
void semaphore::set | ( | unsigned | count | ) |
Alter semaphore limit at runtime.
count | of threads to allow. |
static void semaphore::wait | ( | semaphore & | sync | ) | [inline, static] |
bool semaphore::wait | ( | timeout_t | timeout | ) |
Wait until the semphore usage count is less than the thread limit.
Increase used count for our thread when unblocked, or return without changing if timed out.
timeout | to wait in millseconds. |
Reimplemented from Conditional.
void semaphore::wait | ( | void | ) |
Wait until the semphore usage count is less than the thread limit.
Increase used count for our thread when unblocked.
Reimplemented from Conditional.