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137 lines
2.2 KiB
137 lines
2.2 KiB
2 months ago
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/*
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* The UCW Library -- Threading Helpers
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*
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* (c) 2006--2010 Martin Mares <mj@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#include <ucw/lib.h>
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#include <ucw/threads.h>
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#ifdef CONFIG_UCW_THREADS
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#include <pthread.h>
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#ifdef CONFIG_LINUX
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#include <sys/types.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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#ifdef __NR_gettid
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static pid_t
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ucw_gettid(void)
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{
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return syscall(__NR_gettid);
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}
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#define CONFIG_USE_GETTID
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#endif
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#endif
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/*** Library lock ***/
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static pthread_mutex_t ucwlib_master_mutex;
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void
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ucwlib_lock(void)
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{
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pthread_mutex_lock(&ucwlib_master_mutex);
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}
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void
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ucwlib_unlock(void)
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{
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pthread_mutex_unlock(&ucwlib_master_mutex);
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}
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/*** Thread identifiers ***/
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static int
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ucwlib_tid(void)
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{
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static int tid_counter;
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int tid;
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#ifdef CONFIG_USE_GETTID
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tid = ucw_gettid();
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if (tid > 0)
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return tid;
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/* The syscall might be unimplemented */
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#endif
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ucwlib_lock();
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tid = ++tid_counter;
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ucwlib_unlock();
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return tid;
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}
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/*** Thread context ***/
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static void CONSTRUCTOR_WITH_PRIORITY(10000)
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ucwlib_threads_init_master(void)
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{
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pthread_mutex_init(&ucwlib_master_mutex, NULL);
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}
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#ifdef CONFIG_UCW_TLS
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__thread struct ucwlib_context ucwlib_context;
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int
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ucwlib_thread_id(struct ucwlib_context *c)
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{
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if (!c->_thread_id)
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c->_thread_id = ucwlib_tid();
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return c->_thread_id;
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}
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#else
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static pthread_key_t ucwlib_context_key;
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static void
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ucwlib_free_thread_context(void *p)
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{
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xfree(p);
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}
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static void CONSTRUCTOR_WITH_PRIORITY(10000)
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ucwlib_threads_init(void)
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{
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if (pthread_key_create(&ucwlib_context_key, ucwlib_free_thread_context) < 0)
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die("Cannot create pthread_key: %m");
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}
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struct ucwlib_context *
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ucwlib_thread_context(void)
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{
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struct ucwlib_context *c = pthread_getspecific(ucwlib_context_key);
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if (!c)
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{
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c = xmalloc_zero(sizeof(*c));
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c->_thread_id = ucwlib_tid();
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pthread_setspecific(ucwlib_context_key, c);
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}
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return c;
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}
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#endif /* CONFIG_UCW_TLS */
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#else /* !CONFIG_UCW_THREADS */
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struct ucwlib_context ucwlib_default_context;
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#endif
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#ifdef TEST
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int main(void)
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{
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ucwlib_lock();
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ucwlib_unlock();
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msg(L_INFO, "tid=%d", ucwlib_thread_id(ucwlib_thread_context()));
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return 0;
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}
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#endif
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