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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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TlsAlloc
The TlsAlloc function allocates a thread local storage (TLS) index. Any thread of the
process can subsequently use this index to store and retrieve values that are local
to the thread.
DWORD TlsAlloc(VOID)
Parameters
This function has no parameters.
Return Values
If the function succeeds, the return value is a TLS index.
If the function fails, the return value is 0xFFFFFFFF. To get extended error
information, call GetLastError.
Remarks
The threads of the process can use the TLS index in subsequent calls to the TlsFree, TlsSetValue, or TlsGetValue functions.
TLS indexes are typically allocated during process or dynamic-link library
(DLL) initialization. Once allocated, each thread of the process can use a TLS
index to access its own TLS storage slot. To store a value in its slot, a thread
specifies the index in a call to TlsSetValue. The thread specifies the same index in a subsequent call to TlsGetValue, to retrieve the stored value.
The constant TLS_MINIMUM_AVAILABLE defines the minimum number of TLS indexes
available in each process. This minimum is guaranteed to be at least 64 for all
systems.
TLS indexes are not valid across process boundaries. A DLL cannot assume that
an index assigned in one process is valid in another process.
A DLL might use TlsAlloc, TlsSetValue, TlsGetValue, and TlsFree as follows:
- When a DLL attaches to a process, the DLL uses TlsAlloc to allocate a TLS index. The DLL then allocates some dynamic storage and uses
the TLS index in a call to TlsSetValue to store the address in the TLS slot. This concludes the per-thread
initialization for the initial thread of the process. The TLS index is stored in a
global or static variable of the DLL.
- Each time the DLL attaches to a new thread of the process, the DLL allocates
some dynamic storage for the new thread and uses the TLS index in a call to TlsSetValue to store the address in the TLS slot. This concludes the per-thread
initialization for the new thread.
- Each time an initialized thread makes a DLL call requiring the data in its
dynamic storage, the DLL uses the TLS index in a call to TlsGetValue to retrieve the address of the dynamic storage for that thread.
For additional information on thread local storage, see Thread Local Storage.
See Also
TlsFree, TlsGetValue, TlsSetValue
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