function retrieves the value in the calling thread's thread local storage
(TLS) slot for a specified TLS index. Each thread of a process has its own slot
for each TLS index.
| DWORD dwTlsIndex
||// TLS index to retrieve value for
Specifies a TLS index that was allocated by the TlsAlloc
If the function succeeds, the return value is the value stored in the calling
thread's TLS slot associated with the specified index.
If the function fails, the return value is zero. To get extended error
information, call GetLastError
Note that the data stored in a TLS slot can have a value of zero. In this
case, the return value is zero and GetLastError
TLS indexes are typically allocated by the TlsAlloc
function during process or DLL initialization. Once allocated, each thread of
the process can use a TLS index to access its own TLS storage slot for that
index. The storage slot for each thread is initialized to NULL. A thread
specifies a TLS index in a call to TlsSetValue
, to store a value in its slot. The thread specifies the same index in a
subsequent call to TlsGetValue
, to retrieve the stored value.
were implemented with speed as the primary goal. These functions perform
minimal parameter validation and error checking. In particular, this function
succeeds if dwTlsIndex
is in the range 0 through (TLS_MINIMUM_AVAILABLE
1). It is up to the programmer to ensure that the index is valid.
Win32 functions that return indications of failure call SetLastError
when they fail. They generally do not call SetLastError
when they succeed. The TlsGetValue
function is an exception to this general rule. The TlsGetValue
function calls SetLastError
to clear a thread's last error when it succeeds. That allows checking for the
error-free retrieval of NULL values.
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