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From: Cunming Liang <cunming.liang@intel.com>
To: dev@dpdk.org
Date: Thu, 29 Jan 2015 08:24:22 +0800
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Subject: [dpdk-dev] [PATCH v3 06/16] eal: add rte_gettid() to acquire unique
system tid
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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>
---
lib/librte_eal/bsdapp/eal/eal_thread.c | 9 +++++++++
lib/librte_eal/common/include/rte_eal.h | 27 +++++++++++++++++++++++++++
lib/librte_eal/linuxapp/eal/eal_thread.c | 7 +++++++
3 files changed, 43 insertions(+)
diff --git a/lib/librte_eal/bsdapp/eal/eal_thread.c b/lib/librte_eal/bsdapp/eal/eal_thread.c
index 10220c7..d0c077b 100644
--- a/lib/librte_eal/bsdapp/eal/eal_thread.c
+++ b/lib/librte_eal/bsdapp/eal/eal_thread.c
@@ -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>
@@ -233,3 +234,11 @@ 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;
+}
diff --git a/lib/librte_eal/common/include/rte_eal.h b/lib/librte_eal/common/include/rte_eal.h
index f4ecd2e..8ccdd65 100644
--- a/lib/librte_eal/common/include/rte_eal.h
+++ b/lib/librte_eal/common/include/rte_eal.h
@@ -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 always successful.
+ */
+int rte_sys_gettid(void);
+
+/**
+ * Get system unique thread id.
+ *
+ * @return
+ * On success, returns the thread ID of calling process.
+ * It 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
diff --git a/lib/librte_eal/linuxapp/eal/eal_thread.c b/lib/librte_eal/linuxapp/eal/eal_thread.c
index 748a83a..ed20c93 100644
--- a/lib/librte_eal/linuxapp/eal/eal_thread.c
+++ b/lib/librte_eal/linuxapp/eal/eal_thread.c
@@ -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>
@@ -233,3 +234,9 @@ 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);
+}
--
1.8.1.4