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eal: get unique thread id

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The rte_gettid() wraps the linux and freebsd syscall gettid().
It provides a persistent unique thread id for the calling thread.
It will save the unique id in TLS on the first time.

Signed-off-by: Cunming Liang <cunming.liang@intel.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
This commit is contained in:
Cunming Liang 2015-02-17 10:08:06 +08:00 committed by Thomas Monjalon
parent f8e0f0163a
commit ef76436c68
3 changed files with 43 additions and 0 deletions
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9
lib/librte_eal/bsdapp/eal/eal_thread.c
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@ -39,6 +39,7 @@
#include <sched.h>
#include <pthread_np.h>
#include <sys/queue.h>
#include <sys/thr.h>
#include <rte_debug.h>
#include <rte_atomic.h>
@ -231,3 +232,11 @@ eal_thread_loop(__attribute__((unused)) void *arg)
/* pthread_exit(NULL); */
/* return NULL; */
}
/* require calling thread tid by gettid() */
int rte_sys_gettid(void)
{
long lwpid;
thr_self(&lwpid);
return (int)lwpid;
}

27
lib/librte_eal/common/include/rte_eal.h
View File

@ -41,6 +41,9 @@
*/
#include <stdint.h>
#include <sched.h>
#include <rte_per_lcore.h>
#ifdef __cplusplus
extern "C" {
@ -262,6 +265,30 @@ rte_set_application_usage_hook( rte_usage_hook_t usage_func );
*/
int rte_eal_has_hugepages(void);
/**
* A wrap API for syscall gettid.
*
* @return
* On success, returns the thread ID of calling process.
* It is always successful.
*/
int rte_sys_gettid(void);
/**
* Get system unique thread id.
*
* @return
* On success, returns the thread ID of calling process.
* It is always successful.
*/
static inline int rte_gettid(void)
{
static RTE_DEFINE_PER_LCORE(int, _thread_id) = -1;
if (RTE_PER_LCORE(_thread_id) == -1)
RTE_PER_LCORE(_thread_id) = rte_sys_gettid();
return RTE_PER_LCORE(_thread_id);
}
#ifdef __cplusplus
}
#endif

7
lib/librte_eal/linuxapp/eal/eal_thread.c
View File

@ -39,6 +39,7 @@
#include <pthread.h>
#include <sched.h>
#include <sys/queue.h>
#include <sys/syscall.h>
#include <rte_debug.h>
#include <rte_atomic.h>
@ -231,3 +232,9 @@ eal_thread_loop(__attribute__((unused)) void *arg)
/* pthread_exit(NULL); */
/* return NULL; */
}
/* require calling thread tid by gettid() */
int rte_sys_gettid(void)
{
return (int)syscall(SYS_gettid);
}