Add utils_gettid()

Signed-off-by: Lukasz Dorau <[email protected]>

Author: ldorau

src/utils/utils_common.h

@@ -74,6 +74,9 @@ void util_align_ptr_size(void **ptr, size_t *size, size_t alignment);
 // get the current process ID
 int utils_getpid(void);
 
+// get the current thread ID
+int utils_gettid(void);
+
 #ifdef __cplusplus
 }
 #endif

src/utils/utils_posix_common.c

@@ -25,3 +25,16 @@ size_t util_get_page_size(void) {
 }
 
 int utils_getpid(void) { return getpid(); }
+
+int utils_gettid(void) {
+#ifdef __APPLE__
+    uint64_t tid64;
+    pthread_threadid_np(NULL, &tid64);
+    return (int)tid64;
+#else
+    // Some older OSes does not have
+    // the gettid() function implemented,
+    // so let's use the syscall instead:
+    return syscall(SYS_gettid);
+#endif
+}

src/utils/utils_windows_common.c

@@ -10,6 +10,7 @@
 #include <windows.h>
 
 #include <processenv.h>
+#include <processthreadsapi.h>
 
 #include "utils_concurrency.h"
 
@@ -28,4 +29,7 @@ size_t util_get_page_size(void) {
     util_init_once(&Page_size_is_initialized, _util_get_page_size);
     return Page_size;
 }
+
 int utils_getpid(void) { return GetCurrentProcessId(); }
+
+int utils_gettid(void) { return GetCurrentThreadId(); }