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author | Olivier Goffart <ogoffart@woboq.com> | 2015-11-10 17:52:28 +0100 |
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committer | Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com> | 2015-11-13 15:05:08 +0000 |
commit | 45be40540801bc760b09d731958ba646e4eb946c (patch) | |
tree | 179f96f8e61924ab4172fabd14068980bbd1dcfd /src/corelib/thread/qmutex.cpp | |
parent | 1de3fe0f9bb029b8a742fab678a1bd09dfab586d (diff) |
Document performance of QMutex
Change-Id: I4de2fd5ba717975b5de98ffe7ca6348afbed1b2f
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Diffstat (limited to 'src/corelib/thread/qmutex.cpp')
-rw-r--r-- | src/corelib/thread/qmutex.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/corelib/thread/qmutex.cpp b/src/corelib/thread/qmutex.cpp index 742a572bef..fa3bb080ae 100644 --- a/src/corelib/thread/qmutex.cpp +++ b/src/corelib/thread/qmutex.cpp @@ -139,6 +139,11 @@ public: lock calls unlock(). A non-blocking alternative to lock() is tryLock(). + QMutex is optimized to be fast in the non-contended case. A non-recursive + QMutex will not allocate memory if there is no contention on that mutex. + It is constructed and destroyed with almost no overhead, + which means it is fine to have many mutexes as part of other classes. + \sa QMutexLocker, QReadWriteLock, QSemaphore, QWaitCondition */ @@ -165,6 +170,8 @@ public: a thread may only lock a mutex once. The default is QMutex::NonRecursive. + Recursive mutexes are slower and take more memory than non-recursive ones. + \sa lock(), unlock() */ QMutex::QMutex(RecursionMode mode) |