新增API pthread_gettid()

Signed-off-by: caifuzhou <504631861@qq.com>

libc-test/src/functional/pthread_gettid.c

+#include <pthread.h>
+#include <string.h>
+#include "test.h"
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+
+#define TEST(c, ...) ((c) ? 1 : (t_error(#c" failed: " __VA_ARGS__),0))
+
+static pthread_mutex_t mutex ;
+
+void* pthread_test(void* arg)
+{
+    pthread_mutex_lock(&mutex);
+    *((pid_t *)arg) = gettid();
+    pthread_mutex_unlock(&mutex);
+    return NULL;
+}
+
+int main(int argc, char const *argv[])
+{
+    pthread_mutex_init(&mutex, NULL);
+    TEST(gettid() == pthread_gettid(pthread_self()),"pthread_gettid() is failed\n");
+
+    pthread_mutex_lock(&mutex);
+    pid_t tid;
+    pthread_t t;
+    pthread_create(&t,NULL,pthread_test,&tid);
+    pid_t recv_result = pthread_gettid(t);
+    TEST(0 == pthread_join(t,NULL),"pthread_join is failed\n");
+
+    pthread_mutex_unlock(&mutex);
+    TEST(tid == recv_result,"the tid of pthread or tid of pthread_gettid is wrong\n");
+    return 0;
+}
\ No newline at end of file

libc-test/src/functional/test_src_functional.gni

@@ -23,6 +23,7 @@ functional_list = [
   "pthread_cancel-points",
   "pthread_cancel",
   "pthread_cond",
+  "pthread_gettid",
   "pthread_mutex",
   "pthread_mutex_pi",
   "pthread_robust",

porting/linux/user/include/pthread.h

@@ -96,6 +96,7 @@ int pthread_create(pthread_t *__restrict, const pthread_attr_t *__restrict, void
 int pthread_detach(pthread_t);
 _Noreturn void pthread_exit(void *);
 int pthread_join(pthread_t, void **);
+pid_t pthread_gettid(pthread_t);
 
 #ifdef __GNUC__
 __attribute__((const))

porting/linux/user/src/internal/pthread_impl.h

@@ -183,6 +183,7 @@ hidden void __inhibit_ptc(void);
 hidden void __tl_lock(void);
 hidden void __tl_unlock(void);
 hidden void __tl_sync(pthread_t);
+hidden struct pthread* __pthread_list_find(pthread_t, const char*);
 
 extern hidden volatile int __thread_list_lock;
 

src/thread/pthread_create.c

@@ -6,6 +6,15 @@
 #include <sys/mman.h>
 #include <string.h>
 #include <stddef.h>
+#include <stdarg.h>
+
+void log_print(const char* info,...)
+{
+    va_list ap;
+    va_start(ap, info);
+    vfprintf(stdout,info, ap);
+    va_end(ap);
+}
 
 static void dummy_0()
 {
@@ -380,3 +389,33 @@ fail:
 
 weak_alias(__pthread_exit, pthread_exit);
 weak_alias(__pthread_create, pthread_create);
+
+struct pthread* __pthread_list_find(pthread_t thread_id, const char* info)
+{
+    struct pthread *thread = (struct pthread *)thread_id; 
+    if (NULL == thread) {
+        log_print("invalid pthread_t (0) passed to %s\n", info);
+        return NULL;
+    }
+
+    struct pthread *self = __pthread_self();
+    if (thread == self) {
+        return thread;
+    }
+    struct pthread *t = self;
+    t = t->next ;
+    while (t != self) {
+        if (t == thread) return thread;
+        t = t->next ;
+    } 
+    return NULL;
+}
+
+pid_t __pthread_gettid(pthread_t t)
+{
+    __tl_lock();
+    struct pthread* thread = __pthread_list_find(t, "pthread_gettid");
+    __tl_unlock();
+    return thread ? thread->tid : -1;
+}
+weak_alias(__pthread_gettid, pthread_gettid);
\ No newline at end of file