ACE  6.1.0
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ACE_Thread_Mutex Class Reference

ACE_Thread_Mutex wrapper (only valid for threads in the same process). More...

#include <Thread_Mutex.h>

List of all members.

Public Member Functions

 ACE_Thread_Mutex (const ACE_TCHAR *name=0, ACE_mutexattr_t *attributes=0)
 Constructor.
 ~ACE_Thread_Mutex (void)
 Implicitly destroy the mutex.
int remove (void)
int acquire (void)
 Acquire lock ownership (wait on queue if necessary).
int acquire (ACE_Time_Value &tv)
int acquire (ACE_Time_Value *tv)
int tryacquire (void)
int release (void)
 Release lock and unblock a thread at head of queue.
int acquire_read (void)
int acquire_write (void)
int tryacquire_read (void)
int tryacquire_write (void)
int tryacquire_write_upgrade (void)
const ACE_thread_mutex_t & lock (void) const
 Return the underlying mutex.
ACE_thread_mutex_t & lock (void)
void dump (void) const
 Dump the state of an object.

Public Attributes

 ACE_ALLOC_HOOK_DECLARE
 Declare the dynamic allocation hooks.

Protected Attributes

ACE_thread_mutex_t lock_
 Mutex type that supports single-process locking efficiently.
bool removed_

Private Member Functions

void operator= (const ACE_Thread_Mutex &)
 ACE_Thread_Mutex (const ACE_Thread_Mutex &)

Friends

class ACE_Condition_Thread_Mutex

Detailed Description

ACE_Thread_Mutex wrapper (only valid for threads in the same process).

This implementation is optimized for locking threads that are in the same process. It maps to <CRITICAL_SECTION>s on NT and <ACE_mutex_t> with <type> set to <USYNC_THREAD> on UNIX. ACE_Thread_Mutex is recursive on some platforms (like Win32). However, on most platforms (like Solaris) it is not recursive. To be totally safe and portable, developers should use ACE_Recursive_Thread_Mutex when they need a recursive mutex.


Constructor & Destructor Documentation

ACE_Thread_Mutex::ACE_Thread_Mutex ( const ACE_TCHAR name = 0,
ACE_mutexattr_t *  attributes = 0 
)

Constructor.

ACE_Thread_Mutex::~ACE_Thread_Mutex ( void  )

Implicitly destroy the mutex.

ACE_Thread_Mutex::ACE_Thread_Mutex ( const ACE_Thread_Mutex ) [private]

Member Function Documentation

int ACE_Thread_Mutex::acquire ( void  ) [inline]

Acquire lock ownership (wait on queue if necessary).

int ACE_Thread_Mutex::acquire ( ACE_Time_Value tv) [inline]

Block the thread until we acquire the mutex or until tv times out, in which case -1 is returned with errno == ETIME. Note that tv is assumed to be in "absolute" rather than "relative" time. The value of tv is updated upon return to show the actual (absolute) acquisition time.

int ACE_Thread_Mutex::acquire ( ACE_Time_Value tv) [inline]

If tv == 0 the call acquire() directly. Otherwise, Block the thread until we acquire the mutex or until tv times out, in which case -1 is returned with errno == ETIME. Note that tv is assumed to be in "absolute" rather than "relative" time. The value of tv is updated upon return to show the actual (absolute) acquisition time.

int ACE_Thread_Mutex::acquire_read ( void  ) [inline]

Acquire mutex ownership. This calls acquire() and is only here to make the ACE_Thread_Mutex interface consistent with the other synchronization APIs.

int ACE_Thread_Mutex::acquire_write ( void  ) [inline]

Acquire mutex ownership. This calls acquire() and is only here to make the ACE_Thread_Mutex interface consistent with the other synchronization APIs.

void ACE_Thread_Mutex::dump ( void  ) const

Dump the state of an object.

const ACE_thread_mutex_t & ACE_Thread_Mutex::lock ( void  ) const [inline]

Return the underlying mutex.

ACE_thread_mutex_t & ACE_Thread_Mutex::lock ( void  ) [inline]
void ACE_Thread_Mutex::operator= ( const ACE_Thread_Mutex ) [private]
int ACE_Thread_Mutex::release ( void  ) [inline]

Release lock and unblock a thread at head of queue.

int ACE_Thread_Mutex::remove ( void  ) [inline]

Explicitly destroy the mutex. Note that only one thread should call this method since it doesn't protect against race conditions.

int ACE_Thread_Mutex::tryacquire ( void  ) [inline]

Conditionally acquire lock (i.e., don't wait on queue). Returns -1 on failure. If we "failed" because someone else already had the lock, errno is set to EBUSY.

int ACE_Thread_Mutex::tryacquire_read ( void  ) [inline]

Conditionally acquire mutex (i.e., won't block). This calls tryacquire() and is only here to make the ACE_Thread_Mutex interface consistent with the other synchronization APIs. Returns -1 on failure. If we "failed" because someone else already had the lock, errno is set to EBUSY.

int ACE_Thread_Mutex::tryacquire_write ( void  ) [inline]

Conditionally acquire mutex (i.e., won't block). This calls tryacquire() and is only here to make the ACE_Thread_Mutex interface consistent with the other synchronization APIs. Returns -1 on failure. If we "failed" because someone else already had the lock, errno is set to EBUSY.

int ACE_Thread_Mutex::tryacquire_write_upgrade ( void  ) [inline]

This is only here to make the ACE_Thread_Mutex interface consistent with the other synchronization APIs. Assumes the caller has already acquired the mutex using one of the above calls, and returns 0 (success) always.


Friends And Related Function Documentation

friend class ACE_Condition_Thread_Mutex [friend]

Member Data Documentation

Declare the dynamic allocation hooks.

ACE_thread_mutex_t ACE_Thread_Mutex::lock_ [protected]

Mutex type that supports single-process locking efficiently.

bool ACE_Thread_Mutex::removed_ [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...


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