ACE
6.4.2
|
ACE_Condition template specialization written using ACE_Mutexes. This allows threads to block until shared data changes state. A condition variable enables threads to atomically block and test the condition under the protection of a mutual exclu- sion lock (mutex) until the condition is satisfied. That is, the mutex must have been held by the thread before calling wait or signal on the condition. If the condition is false, a thread blocks on a condition variable and atomically releases the mutex that is waiting for the condition to change. If another thread changes the condition, it may wake up waiting threads by signaling the associated condition variable. The waiting threads, upon awakening, reacquire the mutex and re-evaluate the condition. More...
#include <Condition_Thread_Mutex.h>
Public Member Functions | |
ACE_Condition (ACE_Thread_Mutex &m, const ACE_TCHAR *name=0, void *arg=0) | |
Initialize the condition variable. More... | |
ACE_Condition (ACE_Thread_Mutex &m, const ACE_Condition_Attributes &attributes, const ACE_TCHAR *name=0, void *arg=0) | |
Initialize the condition variable. More... | |
~ACE_Condition (void) | |
Implicitly destroy the condition variable. More... | |
int | remove (void) |
int | wait (const ACE_Time_Value *abstime) |
int | wait (void) |
Block on condition. More... | |
int | wait (ACE_Thread_Mutex &mutex, const ACE_Time_Value *abstime=0) |
int | signal (void) |
Signal one waiting thread. More... | |
int | broadcast (void) |
Signal all waiting threads. More... | |
ACE_Thread_Mutex & | mutex (void) |
Returns a reference to the underlying mutex;. More... | |
void | dump (void) const |
Dump the state of an object. More... | |
Public Attributes | |
ACE_ALLOC_HOOK_DECLARE | |
Declare the dynamic allocation hooks. More... | |
Protected Attributes | |
ACE_cond_t | cond_ |
Condition variable. More... | |
ACE_Thread_Mutex & | mutex_ |
Reference to mutex lock. More... | |
bool | removed_ |
Private Member Functions | |
void | operator= (const ACE_Condition< ACE_Thread_Mutex > &) |
ACE_Condition (const ACE_Condition< ACE_Thread_Mutex > &) | |
ACE_Condition template specialization written using ACE_Mutexes. This allows threads to block until shared data changes state. A condition variable enables threads to atomically block and test the condition under the protection of a mutual exclu- sion lock (mutex) until the condition is satisfied. That is, the mutex must have been held by the thread before calling wait or signal on the condition. If the condition is false, a thread blocks on a condition variable and atomically releases the mutex that is waiting for the condition to change. If another thread changes the condition, it may wake up waiting threads by signaling the associated condition variable. The waiting threads, upon awakening, reacquire the mutex and re-evaluate the condition.
ACE_Condition< ACE_Thread_Mutex >::ACE_Condition | ( | ACE_Thread_Mutex & | m, |
const ACE_TCHAR * | name = 0 , |
||
void * | arg = 0 |
||
) |
Initialize the condition variable.
ACE_Condition< ACE_Thread_Mutex >::ACE_Condition | ( | ACE_Thread_Mutex & | m, |
const ACE_Condition_Attributes & | attributes, | ||
const ACE_TCHAR * | name = 0 , |
||
void * | arg = 0 |
||
) |
Initialize the condition variable.
ACE_Condition< ACE_Thread_Mutex >::~ACE_Condition | ( | void | ) |
Implicitly destroy the condition variable.
|
private |
int ACE_Condition< ACE_Thread_Mutex >::broadcast | ( | void | ) |
Signal all waiting threads.
void ACE_Condition< ACE_Thread_Mutex >::dump | ( | void | ) | const |
Dump the state of an object.
|
inline |
Returns a reference to the underlying mutex;.
|
private |
|
inline |
Explicitly destroy the condition variable. Note that only one thread should call this method since it doesn't protect against race conditions.
int ACE_Condition< ACE_Thread_Mutex >::signal | ( | void | ) |
Signal one waiting thread.
int ACE_Condition< ACE_Thread_Mutex >::wait | ( | const ACE_Time_Value * | abstime | ) |
Block on condition, or until absolute time-of-day has passed. If abstime == 0 use "blocking" wait semantics. Else, if abstime != 0 and the call times out before the condition is signaled wait() returns -1 and sets errno to ETIME.
int ACE_Condition< ACE_Thread_Mutex >::wait | ( | void | ) |
Block on condition.
int ACE_Condition< ACE_Thread_Mutex >::wait | ( | ACE_Thread_Mutex & | mutex, |
const ACE_Time_Value * | abstime = 0 |
||
) |
Block on condition or until absolute time-of-day has passed. If abstime == 0 use "blocking" wait() semantics on the mutex passed as a parameter (this is useful if you need to store the <Condition> in shared memory). Else, if abstime != 0 and the call times out before the condition is signaled <wait> returns -1 and sets errno to ETIME.
ACE_Condition< ACE_Thread_Mutex >::ACE_ALLOC_HOOK_DECLARE |
Declare the dynamic allocation hooks.
|
protected |
Condition variable.
|
protected |
Reference to mutex lock.
|
protected |
Keeps track of whether remove() has been called yet to avoid multiple remove() calls, e.g., explicitly and implicitly in the destructor. This flag isn't protected by a lock, so make sure that you don't have multiple threads simultaneously calling remove() on the same object, which is a bad idea anyway...