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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| Yes
| Import Library
| kernel32.lib
| Header File
| winbase.h
| Unicode
| No
| Platform Notes
| None
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EnterCriticalSection
The EnterCriticalSection function waits for ownership of the specified critical section object. The
function returns when the calling thread is granted ownership.
VOID EnterCriticalSection(
LPCRITICAL_SECTION lpCriticalSection
| // pointer to critical section object
| );
|
|
Parameters
lpCriticalSection
Points to the critical section object.
Return Values
This function does not return a value.
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 access to 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 accesses 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 owner and
access the protected resource. The thread must call LeaveCriticalSection once for each time that it entered the critical section. The thread enters
the critical section each time EnterCriticalSection and TryEnterCriticalSection succeed.
Once a thread has ownership of a critical section, it can make additional
calls to EnterCriticalSection or TryEnterCriticalSection without blocking its execution. This prevents a thread from deadlocking
itself while waiting for a critical section that it already owns.
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, InitializeCriticalSection, LeaveCriticalSection TryEnterCriticalSection
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