Wrapper for readers/writer locks that exist across processes.
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#include <RW_Process_Mutex.h>
Wrapper for readers/writer locks that exist across processes.
- Note
- This class uses an ACE_File_Lock as its implementation. Thus, it can only be reliably used between separate processes, rather than threads in the same process. This isn't a limitation of ACE, it's simply the file lock semantics on UNIX and Win32.
- Todo:
- For systems with pthread_rwlockattr_setpshared one may consider using them to make the mutex faster.
Create a cross-process readers/writer mutex, passing in the optional name, flags and mode
- See also
- ACE_File_Lock. If not specified, a name is generated and flags and mode are set to default platform values.
ACE_RW_Process_Mutex::~ACE_RW_Process_Mutex |
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void |
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int ACE_RW_Process_Mutex::acquire |
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void |
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inline |
Same as acquire_write(). Acquire lock ownership; blocks until the lock is acquired or the operation fails.
int ACE_RW_Process_Mutex::acquire_read |
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void |
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inline |
Acquire read lock; blocks until the lock is acquired or the operation fails.
int ACE_RW_Process_Mutex::acquire_write |
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void |
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inline |
Acquire write lock; blocks until the lock is acquired or the operation fails.
void ACE_RW_Process_Mutex::dump |
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void |
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const |
Dump the state of an object.
Return the underlying lock.
int ACE_RW_Process_Mutex::release |
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void |
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inline |
int ACE_RW_Process_Mutex::remove |
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void |
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inline |
Explicitly destroy the mutex. Note that only one thread should call this method since it doesn't protect against race conditions.
int ACE_RW_Process_Mutex::tryacquire |
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void |
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inline |
Same as tryacquire_write(). Try to acquire the lock, but do not block if the lock is not immediately acquired.
- Return values
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-1 | on failure. If the lock is already held, errno is set to EBUSY . |
int ACE_RW_Process_Mutex::tryacquire_read |
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void |
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inline |
Try to acquire the read lock, but do not block if the lock is not immediately acquired.
- Return values
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-1 | on failure. If the lock is already held, errno is set to EBUSY . |
int ACE_RW_Process_Mutex::tryacquire_write |
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void |
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inline |
Try to acquire the write lock, but do not block if the lock is not immediately acquired.
- Return values
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-1 | on failure. If the lock is already held, errno is set to EBUSY . |
int ACE_RW_Process_Mutex::tryacquire_write_upgrade |
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void |
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inline |
Attempt to upgrade a read lock to a write lock. Returns 0 on success, -1 on failure.
const ACE_TCHAR * ACE_RW_Process_Mutex::unique_name |
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void |
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private |
Create and return the unique name.
ACE_RW_Process_Mutex::ACE_ALLOC_HOOK_DECLARE |
Declare the dynamic allocation hooks.
We need this to get the readers/writer semantics...
If the user does not provide a name we generate a unique name in this buffer.
The documentation for this class was generated from the following files: