Semiconductor & Computer Engineering
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| − | <small>''This article is about C11 thread support, not [[POSIX Threads]].''</small> | + | {{c title|Concurrency}} |
| + | <small>''This article is about [[C11]] thread support, not [[POSIX Threads]].''</small> | ||
| − | The [[C programming language]] introduced the semantics necessary for writing a multithreaded program starting with the [[C11]] standard. The standard also specified a set of functions to facilitate inter‐thread communication. These features are provided via the thread library headers which can be utilized by including the | + | The [[C programming language]] introduced the semantics necessary for writing a multithreaded program starting with the [[C11]] standard. The standard also specified a set of functions to facilitate inter‐thread communication. These features are provided via the thread library headers which can be utilized by including the {{C|threads.h|<threads.h>}} and {{C|stdatomic.h|<stdatomic.h>}} {{C|standard library|standard headers}}. |
== Optional == | == Optional == | ||
| − | Thread support is an optional features for implementations where support for multithreaded programs is possible. The macro <code>__STDC_NO_THREADS__</code> must be set to <code>1</code> if the implementation does not support the | + | Thread support is an optional features for implementations where support for multithreaded programs is possible. The macro <code>__STDC_NO_THREADS__</code> must be set to <code>1</code> if the implementation does not support the {{C|threads.h|<threads.h>}} header. |
<source lang="C"> | <source lang="C"> | ||
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== Creating A Thread == | == Creating A Thread == | ||
| − | One of the functions included in | + | One of the functions included in {{C|threads.h|<threads.h>}} is {{C|threads.h/thrd_create|thrd_create()}}, |
<code lang="C>int thrd_create(thrd_t *thr, thrd_start_t func, void *arg);</code> | <code lang="C>int thrd_create(thrd_t *thr, thrd_start_t func, void *arg);</code> | ||
Latest revision as of 07:30, 4 January 2015
This article is about C11 thread support, not POSIX Threads.
The C programming language introduced the semantics necessary for writing a multithreaded program starting with the C11 standard. The standard also specified a set of functions to facilitate inter‐thread communication. These features are provided via the thread library headers which can be utilized by including the <threads.h> and <stdatomic.h> standard headers.
Optional[edit]
Thread support is an optional features for implementations where support for multithreaded programs is possible. The macro __STDC_NO_THREADS__ must be set to 1 if the implementation does not support the <threads.h> header.
#if (__STDC_VERSION__ >= 201112L) && (__STDC_NO_THREADS__ != 1)
/* thread support */
#endif
Creating A Thread[edit]
One of the functions included in <threads.h> is thrd_create(),
int thrd_create(thrd_t *thr, thrd_start_t func, void *arg);
Which creates a new thread executing func(arg). On a successful operation, the object pointed to by thr to the identifier of the newly created thread and thrd_success will be returned. Upon failure thrd_error or thrd_nomem will be returned indicating insufficient amount of memory or failure to honor the request.