diff --git a/base/hlog.c b/base/hlog.c
index 092fe6ae0..cb149d11c 100644
--- a/base/hlog.c
+++ b/base/hlog.c
@@ -5,6 +5,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdarg.h>
+#include <stdint.h>
 #include <time.h>
 
 //#include "hmutex.h"
@@ -26,6 +27,30 @@
 #define hmutex_unlock       pthread_mutex_unlock
 #endif
 
+// Self-contained pid/tid for the %p/%t format specifiers. hlog is meant to be
+// usable standalone (only depending on hexport.h), so we don't pull in
+// hthread.h/hplatform.h here; instead inline the platform primitives, using
+// the headers already included above (windows.h / pthread.h).
+#ifdef _WIN32
+#define hlog_getpid()   (long)GetCurrentProcessId()
+#define hlog_gettid()   (long)GetCurrentThreadId()
+#else
+#include <unistd.h>         // for getpid
+#define hlog_getpid()   (long)getpid()
+#if defined(__linux__)
+#include <sys/syscall.h>    // for SYS_gettid
+static inline long hlog_gettid() { return (long)syscall(SYS_gettid); }
+#elif defined(__APPLE__)
+static inline long hlog_gettid() {
+    uint64_t tid = 0;
+    pthread_threadid_np(NULL, &tid);
+    return (long)tid;
+}
+#else
+#define hlog_gettid()   (long)pthread_self()
+#endif
+#endif
+
 //#include "htime.h"
 #define SECONDS_PER_HOUR    3600
 #define SECONDS_PER_DAY     86400   // 24*3600
@@ -478,6 +503,12 @@ int logger_print(logger_t* logger, int level, const char* fmt, ...) {
                         buf[len++] = plevel[i];
                     }
                     break;
+                case 'p':
+                    len += snprintf(buf + len, bufsize - len, "%ld", hlog_getpid());
+                    break;
+                case 't':
+                    len += snprintf(buf + len, bufsize - len, "%ld", hlog_gettid());
+                    break;
                 case 's':
                 {
                     va_list ap;
diff --git a/base/hlog.h b/base/hlog.h
index 4ebf7fff1..ed420dc20 100644
--- a/base/hlog.h
+++ b/base/hlog.h
@@ -100,6 +100,8 @@ HV_EXPORT void logger_set_level_by_str(logger_t* logger, const char* level);
  * %Z us
  * %l First character of level
  * %L All characters of level
+ * %p pid (process id)
+ * %t tid (thread id)
  * %s message
  * %% %
  */