1 files changed, 33 insertions, 0 deletions
diff --git a/src/libnetdata/os/gettid.c b/src/libnetdata/os/gettid.c
new file mode 100644
index 000000000..273c428f8
--- /dev/null
+++ b/src/libnetdata/os/gettid.c
@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "../libnetdata.h"
+
+#if defined(OS_WINDOWS)
+#include <windows.h>
+#endif
+
+pid_t os_gettid(void) {
+#if defined(HAVE_GETTID)
+    return gettid();
+#elif defined(HAVE_PTHREAD_GETTHREADID_NP)
+    return (pid_t)pthread_getthreadid_np();
+#elif defined(HAVE_PTHREAD_THREADID_NP)
+    uint64_t curthreadid;
+    pthread_threadid_np(NULL, &curthreadid);
+    return curthreadid;
+#elif defined(OS_WINDOWS)
+    return (pid_t)GetCurrentThreadId();
+#elif defined(OS_LINUX)
+    return (pid_t)syscall(SYS_gettid);
+#else
+    return (pid_t)pthread_self();
+#endif
+}
+
+static __thread pid_t gettid_cached_tid = 0;
+pid_t gettid_cached(void) {
+    if(unlikely(gettid_cached_tid == 0))
+        gettid_cached_tid = os_gettid();
+
+    return gettid_cached_tid;
+}
+\ No newline at end of file