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author | Joel Sherrill <joel@rtems.org> | 2016-02-19 16:00:48 -0600 |
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committer | Joel Sherrill <joel@rtems.org> | 2016-04-14 16:28:10 -0500 |
commit | 8228548d127dd73439615f45f38f92b8a42bcfed (patch) | |
tree | b7a48c833e30bcbd736f649815129c8aff2201f4 /cpukit/posix/src | |
parent | posix: Run key destructors during thread restart (diff) | |
download | rtems-8228548d127dd73439615f45f38f92b8a42bcfed.tar.bz2 |
Add pthread_getconcurrency() and pthread_setconcurrency()
This is the very simple implementation specified by the Open Group
for implementations with 1:1 kernel thread to user thread mappings.
http://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_getconcurrency.html
updates #2680.
Diffstat (limited to 'cpukit/posix/src')
-rw-r--r-- | cpukit/posix/src/pthreadconcurrency.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/cpukit/posix/src/pthreadconcurrency.c b/cpukit/posix/src/pthreadconcurrency.c new file mode 100644 index 0000000000..7e9c9c0b18 --- /dev/null +++ b/cpukit/posix/src/pthreadconcurrency.c @@ -0,0 +1,42 @@ +#if HAVE_CONFIG_H +#include "config.h" +#endif + +/** + * @file + * + * @brief Pthread Get/Set Concurrency + * @ingroup POSIXAPI + * + * Per the Open Group specification, when user pthreads are mapped 1:1 + * onto kernel threads, the implementation simply tracks an internal + * variable whose initial value is 0. If it is set, subsequent calls to + * obtain the value return that previously set. + */ + +/* + * COPYRIGHT (c) 2016. + * On-Line Applications Research Corporation (OAR). + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + +#include <pthread.h> +#include <errno.h> + +static int pthread_concurrency_level; + +int pthread_getconcurrency(void) +{ + return pthread_concurrency_level; +} + +int pthread_setconcurrency( + int new_level +) +{ + pthread_concurrency_level = new_level; + return 0; +} |