3 files changed, 56 insertions, 1 deletions
diff --git a/src/port/meson.build b/src/port/meson.build
index 0a16f1c..900076d 100644
--- a/src/port/meson.build
+++ b/src/port/meson.build
@@ -35,6 +35,7 @@ if host_system == 'windows'
     'win32error.c',
     'win32fdatasync.c',
     'win32fseek.c',
+    'win32gai_strerror.c',
     'win32getrusage.c',
     'win32link.c',
     'win32ntdll.c',
diff --git a/src/port/pthread-win32.h b/src/port/pthread-win32.h
index 97ccc17..5f33269 100644
--- a/src/port/pthread-win32.h
+++ b/src/port/pthread-win32.h
@@ -5,7 +5,16 @@
 #define __PTHREAD_H
 
 typedef ULONG pthread_key_t;
-typedef CRITICAL_SECTION *pthread_mutex_t;
+
+typedef struct pthread_mutex_t
+{
+	/* initstate = 0: not initialized; 1: init done; 2: init in progress */
+	LONG		initstate;
+	CRITICAL_SECTION csection;
+} pthread_mutex_t;
+
+#define PTHREAD_MUTEX_INITIALIZER	{ 0 }
+
 typedef int pthread_once_t;
 
 DWORD		pthread_self(void);
diff --git a/src/port/win32gai_strerror.c b/src/port/win32gai_strerror.c
new file mode 100644
index 0000000..5b47d17
--- /dev/null
+++ b/src/port/win32gai_strerror.c
@@ -0,0 +1,45 @@
+/*-------------------------------------------------------------------------
+ *
+ * win32gai_strerror.c
+ *	  Thread-safe gai_strerror() for Windows.
+ *
+ * Portions Copyright (c) 2024, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *    src/port/win32gai_strerror.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include <sys/socket.h>
+
+/*
+ * Windows has gai_strerrorA(), but it is not thread-safe so we avoid it.
+ *
+ * https://learn.microsoft.com/en-us/windows/win32/api/ws2tcpip/nf-ws2tcpip-gai_strerrora
+ */
+const char *
+gai_strerror(int errcode)
+{
+	switch (errcode)
+	{
+		case EAI_AGAIN:
+			return "Temporary failure in name resolution";
+		case EAI_BADFLAGS:
+			return "Bad value for ai_flags";
+		case EAI_FAIL:
+			return "Non-recoverable failure in name resolution";
+		case EAI_FAMILY:
+			return "ai_family not supported";
+		case EAI_MEMORY:
+			return "Memory allocation failure";
+		case EAI_NONAME:
+			return "Name or service not known";
+		case EAI_SERVICE:
+			return "Servname not supported for ai_socktype";
+		case EAI_SOCKTYPE:
+			return "ai_socktype not supported";
+		default:
+			return "Unknown server error";
+	}
+}