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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| No
| Win32s
| No
| Import Library
| kernel32.lib
| Header File
| winbase.h
| Unicode
| No
| Platform Notes
| None
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TryEnterCriticalSection
[New - Windows NT]
The TryEnterCriticalSection function attempts to enter a critical section without blocking. If the call
is successful, the calling thread takes ownership of the critical section.
BOOL TryEnterCriticalSection(
LPCRITICAL_SECTION lpCriticalSection
| // pointer to critical section object
| );
|
|
Parameters
lpCriticalSection
Specifies the critical section object.
Return Values
If the critical section is successfully entered or the current thread already
owns the critical section, the return value is nonzero.
If another thread already owns the critical section, the return value is zero.
Remarks
The threads of a single process can use a critical section object for
mutual-exclusion synchronization. The process is responsible for allocating the memory
used by a critical section object, which it can do by declaring a variable of
type CRITICAL_SECTION. Before using a critical section, some thread of the
process must call the InitializeCriticalSection function to initialize the object.
To enable mutually exclusive use of a shared resource, each thread calls the EnterCriticalSection or TryEnterCriticalSection function to request ownership of the critical section before executing any
section of code that uses the protected resource. The difference is that TryEnterCriticalSection returns immediately, regardless of whether it obtained ownership of the
critical section, while EnterCriticalSection blocks until the thread can take ownership of the critical section. When it
has finished executing the protected code, the thread uses the LeaveCriticalSection function to relinquish ownership, enabling another thread to become the owner
and gain access to the protected resource. The thread must call LeaveCriticalSection once for each time that it entered the critical section.
Any thread of the process can use the DeleteCriticalSection function to release the system resources that were allocated when the
critical section object was initialized. After this function has been called, the
critical section object can no longer be used for synchronization.
See Also
DeleteCriticalSection, EnterCriticalSection, InitializeCriticalSection, LeaveCriticalSection
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