tss_set
From cppreference.com
C
Concurrency support (C11)
Concurrency support library
Threads
Atomic operations
(until C23)
Atomic flags
Memory ordering
Mutual exclusion
Condition variables
Thread-local storage
Defined in header
<threads.h>
int tss_set( tss_t tss_id, void *val );
(since C11)
Sets the value of the thread-specific storage identified by tss_id for the current thread to val. Different threads may set different values to the same key.
The destructor, if available, is not invoked.
[edit] Parameters
tss_id
-
thread-specific storage key, obtained from tss_create and not deleted by tss_delete
val
-
value to set thread-specific storage to
[edit] Return value
thrd_success if successful, thrd_error otherwise.
[edit] Notes
The POSIX equivalent of this function is pthread_setspecific.
Typically TSS is used to store pointers to blocks of dynamically allocated memory that have been reserved for use by the calling thread.
tss_set may be called in the TSS destructor. If the destructor exits with non-NULL value in the TSS storage, it will be retried by thrd_exit up to TSS_DTOR_ITERATIONS times, after which the storage will be lost.
[edit] Example
This section is incomplete
Reason: improve, perhaps look for POSIX examples for inspiration
Reason: improve, perhaps look for POSIX examples for inspiration
int thread_func(void *arg) { tss_t key; if (thrd_success == tss_create (&key, free )) { tss_set(key, malloc (4)); // stores a pointer on TSS // ... } } // calls free() for the pointer stored on TSS
[edit] References
- C17 standard (ISO/IEC 9899:2018):
- 7.26.6.4 The tss_set function (p: 282-283)
- C11 standard (ISO/IEC 9899:2011):
- 7.26.6.4 The tss_set function (p: 387)