# ACE_Recursive_Thread_Mutex Class Reference

Implement a C++ wrapper that allows nested acquisition and release of a mutex that occurs in the same thread. More...

`#include <Recursive_Thread_Mutex.h>`

Collaboration diagram for ACE_Recursive_Thread_Mutex:

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List of all members.

## Public Member Functions

| ACE_Recursive_Thread_Mutex (const ACE_TCHAR *name=0, ACE_mutexattr_t *arg=0)
| Initialize a recursive mutex.
| ~ACE_Recursive_Thread_Mutex (void)
| Implicitly release a recursive mutex.
int | remove (void)
int | acquire (void)
int | tryacquire (void)
int | acquire_read (void)
int | acquire_write (void)
int | tryacquire_read (void)
int | tryacquire_write (void)
int | tryacquire_write_upgrade (void)
int | release (void)
ACE_thread_t | get_thread_id (void)
| Return the id of the thread that currently owns the mutex.
int | get_nesting_level (void)
ACE_recursive_thread_mutex_t & | mutex (void)
| Returns a reference to the recursive mutex;.
ACE_thread_mutex_t & | get_nesting_mutex (void)
| Returns a reference to the recursive mutex's internal mutex;.
void | dump (void) const
| Dump the state of an object.

## Public Attributes

| ACE_ALLOC_HOOK_DECLARE
| Declare the dynamic allocation hooks.

## Protected Member Functions

void | set_thread_id (ACE_thread_t t)

## Protected Attributes

ACE_recursive_thread_mutex_t | lock_
| Recursive mutex.
int | removed_

## Private Member Functions

void | operator= (const ACE_Recursive_Thread_Mutex &)
| ACE_Recursive_Thread_Mutex (const ACE_Recursive_Thread_Mutex &)

## Detailed Description

Implement a C++ wrapper that allows nested acquisition and release of a mutex that occurs in the same thread.

## Constructor & Destructor Documentation

ACE_BEGIN_VERSIONED_NAMESPACE_DECL ACE_Recursive_Thread_Mutex::ACE_Recursive_Thread_Mutex | ( | const ACE_TCHAR * | name = `0`,
|  | ACE_mutexattr_t * | arg = `0`
| ) |

| Initialize a recursive mutex.

ACE_Recursive_Thread_Mutex::~ACE_Recursive_Thread_Mutex | ( | void |  | ) |

| Implicitly release a recursive mutex.

ACE_Recursive_Thread_Mutex::ACE_Recursive_Thread_Mutex | ( | const ACE_Recursive_Thread_Mutex & |  | ) | `[private]`

## Member Function Documentation

int ACE_Recursive_Thread_Mutex::acquire | ( | void |  | ) |

| Acquire a recursive mutex (will increment the nesting level and not deadmutex if the owner of the mutex calls this method more than once).

ACE_INLINE int ACE_Recursive_Thread_Mutex::acquire_read | ( | void |  | ) |

| Acquire mutex ownership. This calls <acquire> and is only here to make the <ace_recusive_thread_mutex> interface consistent with the other synchronization APIs.

ACE_INLINE int ACE_Recursive_Thread_Mutex::acquire_write | ( | void |  | ) |

| Acquire mutex ownership. This calls <acquire> and is only here to make the <ace_recusive_thread_mutex> interface consistent with the other synchronization APIs.

void ACE_Recursive_Thread_Mutex::dump | ( | void |  | ) | const

| Dump the state of an object.

int ACE_Recursive_Thread_Mutex::get_nesting_level | ( | void |  | ) |

| Return the nesting level of the recursion. When a thread has acquired the mutex for the first time, the nesting level == 1. The nesting level is incremented every time the thread acquires the mutex recursively.

ACE_INLINE ACE_thread_mutex_t & ACE_Recursive_Thread_Mutex::get_nesting_mutex | ( | void |  | ) |

| Returns a reference to the recursive mutex's internal mutex;.

ACE_thread_t ACE_Recursive_Thread_Mutex::get_thread_id | ( | void |  | ) |

| Return the id of the thread that currently owns the mutex.

ACE_BEGIN_VERSIONED_NAMESPACE_DECL ACE_INLINE ACE_recursive_thread_mutex_t & ACE_Recursive_Thread_Mutex::mutex | ( | void |  | ) |

| Returns a reference to the recursive mutex;.

void ACE_Recursive_Thread_Mutex::operator= | ( | const ACE_Recursive_Thread_Mutex & |  | ) | `[private]`

int ACE_Recursive_Thread_Mutex::release | ( | void |  | ) |

| Releases a recursive mutex (will not release mutex until all the nesting level drops to 0, which means the mutex is no longer held).

int ACE_Recursive_Thread_Mutex::remove | ( | void |  | ) |

| Implicitly release a recursive mutex. Note that only one thread should call this method since it doesn't protect against race conditions.

ACE_INLINE void ACE_Recursive_Thread_Mutex::set_thread_id | ( | ACE_thread_t | t | ) | `[protected]`

int ACE_Recursive_Thread_Mutex::tryacquire | ( | void |  | ) |

| Conditionally acquire a recursive mutex (i.e., won't block). Returns -1 on failure. If we "failed" because someone else already had the lock, <errno> is set to <ebusy>.

ACE_INLINE int ACE_Recursive_Thread_Mutex::tryacquire_read | ( | void |  | ) |

| Conditionally acquire mutex (i.e., won't block). This calls <tryacquire> and is only here to make the <ace_recusive_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>.

ACE_INLINE int ACE_Recursive_Thread_Mutex::tryacquire_write | ( | void |  | ) |

| Conditionally acquire mutex (i.e., won't block). This calls <tryacquire> and is only here to make the <ace_recusive_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>.

ACE_INLINE int ACE_Recursive_Thread_Mutex::tryacquire_write_upgrade | ( | void |  | ) |

| This is only here to make the ACE_Recursive_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.

## Member Data Documentation

ACE_Recursive_Thread_Mutex::ACE_ALLOC_HOOK_DECLARE

| Declare the dynamic allocation hooks.

ACE_recursive_thread_mutex_t ACE_Recursive_Thread_Mutex::lock_ `[protected]`

| Recursive mutex.

int ACE_Recursive_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:

- Recursive_Thread_Mutex.h
- Recursive_Thread_Mutex.cpp
- Recursive_Thread_Mutex.inl