| | 1 | \section{\class{wxCriticalSection}}\label{wxcriticalsection} |
| | 2 | |
| | 3 | A critical section object is used for the same exactly purpose as |
| | 4 | \helpref{mutexes}{wxMutex}. The only difference is that under Windows platform |
| | 5 | critical sections are only visible inside one process, while mutexes may be |
| | 6 | shared between processes, so using critical sections is slightly more |
| | 7 | efficient. The terminology is also slightly different: mutex may be locked (or |
| | 8 | acquired) and unlocked (or released) while critical section is entered and left |
| | 9 | by the program. |
| | 10 | |
| | 11 | Finally, you should try to use |
| | 12 | \helpref{wxCriticalSectionLocker}{wxcriticalsectionlocker} class whenever |
| | 13 | possible instead of directly using wxCriticalSection for the same reasons |
| | 14 | \helpref{wxMutexLocker}{wxmutexlocker} is preferrable to |
| | 15 | \helpref{wxMutex}{wxmutex} - please see wxMutex for an example. |
| | 16 | |
| | 17 | \wxheading{Derived from} |
| | 18 | |
| | 19 | None. |
| | 20 | |
| | 21 | \wxheading{Include files} |
| | 22 | |
| | 23 | <wx/thread.h> |
| | 24 | |
| | 25 | \wxheading{See also} |
| | 26 | |
| | 27 | \helpref{wxThread}{wxthread}, \helpref{wxCondition}{wxcondition}, |
| | 28 | \helpref{wxMutexLocker}{wxmutexlocker}, \helpref{wxCriticalSection}{wxcriticalsection} |
| | 29 | |
| | 30 | \latexignore{\rtfignore{\wxheading{Members}}} |
| | 31 | |
| | 32 | \membersection{wxCriticalSection::wxCriticalSection}\label{wxcriticalsectionctor} |
| | 33 | |
| | 34 | \func{}{wxCriticalSection}{\void} |
| | 35 | |
| | 36 | Default constructor initializes critical section object. |
| | 37 | |
| | 38 | \membersection{wxCriticalSection::\destruct{wxCriticalSection}}\label{wxcriticalsectiondtor} |
| | 39 | |
| | 40 | \func{}{\destruct{wxCriticalSection}}{\void} |
| | 41 | |
| | 42 | Destructor frees the ressources. |
| | 43 | |
| | 44 | \membersection{wxCriticalSection::Enter}\label{wxcriticalsectionenter} |
| | 45 | |
| | 46 | \func{void }{Enter}{\void} |
| | 47 | |
| | 48 | Enter the critical section (same as locking a mutex). There is no error return |
| | 49 | for this function. After entering the critical section protecting some global |
| | 50 | data the thread running in critical section may safely use/modify it. |
| | 51 | |
| | 52 | \membersection{wxCriticalSection::Leave}\label{wxcriticalsectionleave} |
| | 53 | |
| | 54 | \func{void }{Leave}{\void} |
| | 55 | |
| | 56 | Leave the critical section allowing other threads use the global data protected |
| | 57 | by it. There is no error return for this function. |
| | 58 | |
projects / wxWidgets.git / blame_incremental