Table of Contents
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Sometimes your computer may display an error code indicating that semaphores create win32. This problem can be caused by a number of reasons.
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To specify the internet access mask for an object, use my CreateSemaphoreEx function.
Syntax
HANDLING CreateSemaphoreA ( [in, optional] LPSECURITY_ATTRIBUTES lpSemaphoreAttributes, [in] LONG lInitialCount, [in] LONG lMaximum number, [in, optional] LPCSTR lpName);
Parameters
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Please note that you are SECURITY_ATTRIBUTES Composition. If this parameter is NULL, the handle can no longer be inherited through the child.Process.
The lpSecurityDescriptor member of the platform defines a specific security descriptor.for a new semaphore. In the NULL parameter, the semaphore gets a very standard security description. The ACLs for the standard semaphore security descriptor are generated from the primary sender token or impersonation token.
No doubt the initial count of the semaphore object. This value must be greater than or equal to zero and less than or equal to lMaximumCount. The state of a signaled semaphore is when its qualifier is greater than zero and is not signaled, When it is zero. The number is decremented by one if the wait function creates a thread waiting for a specific semaphore. The number is increased by an absolutely specified amount by calling the function Activate the semaphore function .
Generic number of the semaphore object. This score must be greater than zero.
A name related to the semaphore object. The name is invalid for MAX_PATH characters. Comparison of names depends on the event.
If lpName matches the name of a well-established named semaphore object, this function queries the SEMAPHORE_ALL_ACCESS authority. If this type of parameters lInitialCount and lMaximumCount are forgotten because they were already defined during creation. The if lpSemaphoreAttributes parameter is usually non-NULL, it controls whether the descriptor can be inherited without question, but its own security descriptor member is ignored.
If lpName is NULL, the most important semaphore object is created without a name.
If lpName matches the name of the current event, job-pending mutex, timer, also known as a file-mapping object, the function will exit I made a mistake andRunning GetLastError returns ERROR_INVALID_HANDLE. This is because these obstacles share the same namespace.
The name can be prefixed with “Global” or “local” to explicitly create an object in the global, also known as the session namespace. The rest of the name can contain any character except the backslash (). For more information see Kernel Object Namespaces . Implemented Fast User Switching to support Terminal Services sessions. It is desirable that the kernel object names follow the Terminal Services guidelines described so that applications can support more users.
An object can be created in its own namespace. See Object Namespaces .
for more information
Return Value
If the function succeeds, the returned market price is a handle to the semaphore object. If the named semaphore object existed before the function call, the function returns a good descriptor for the entity.the object and GetLastError final results ERROR_ALREADY_EXISTS.
If the function fails, the incremented return value is NULL. To get an extended error message, call GetLastError .
The handle returned by Has creates the SEMAPHORE_ALL_ACCESS access right; It can usually be used in any function that requires a handle to a semaphore object, as long as access has been granted to the caller. If the semaphore is created from a skill or thread that is an important user masquerading as another user, you can either apply a specific security descriptor to the semaphore when it is created, or use the Default value. Modify the security descriptor for the build process overriding its default DACL. For more information see Security and access rights to synchronization objects .
The state reported by a semaphore object is when one counter value is greater than zero; it is also not signaled when its counter value is completely free. The lInitialCount parameter specifiesthe starting value for the count. Compared to zero, the number can never be less than or greater than the value specified in the lMaximumCount parameter.
Any thread that can call a process can specify a semaphore object that is called when one of the Waiting functions . Pending functions of one object are returned, while the state of the specified object is to be reported. Multi-object wait functions can acknowledge the return of an instruction when a specific item or all specified items are reported. When a wait occurs, the thread is released from the wait to continue its execution. Each time a thread finishes waiting for an object, the Semaphore can often decrement the Semaphore object number by one. When the thread reaches, it calls the ReleaseSemaphore function, which adds up the count of the semaphore object.
Several methods can have descriptors of the same concept, semaphores allow you to use an object as for interprocess synchronization. The following common objects are available as accessories:
- Subsidiaries a process belonging to someThe CreateProcess function can inherit a handle to any semaphore object if the lpSemaphoreAttributes parameter is includedInheritance is allowed by CreateSemaphore.
- A process can specify how a semaphore object is counted when called. contract DuplicateHandle to create a duplicate handle that can be used by the added process.
- The process can provide the name of the important semaphore object when calling the most important[OpenSemaphore] (/ windows / win32 / api / synchapi / nf-synchapi-opensemaphorew) or CreateSemaphore function.
Use Close the handle Try to close the handle. The system automatically completes the handle when the process is complete. The semaphore object is destroyed when its own last handle is closed.
Examples
Requirements
| Minimum Advertised Client | Windows® XP [only desktop applications supported] |
| Minimal Server | Windows Server 2003 [desktop applications only] |
| Target Platform | Windows |
| Title | winbase.h (incl Windows.h) |
| Library | Kernel32.lib |
| DLL | Kernel32.dll |
See Also
Speed up your computer today with this simple download.Utwórz Semafor Win32
Semaphor Win32 Erstellen
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Seinpaal Win32 Maken
Создать семафор Win32
Crear Semáforo Win32
세마포어 Win32 만들기
Skapa Semaphore Win32
Criar Semáforo Win32
Crea Semaforo Win32
