From f5c4671bfbad96bf346bd7e9a21fc4317b4959df Mon Sep 17 00:00:00 2001
From: Indrajith K L
Date: Sat, 3 Dec 2022 17:00:20 +0530
Subject: Adds most of the tools

---
 v_windows/v/vlib/os/filelock/lib_windows.c.v | 75 ++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 v_windows/v/vlib/os/filelock/lib_windows.c.v

(limited to 'v_windows/v/vlib/os/filelock/lib_windows.c.v')

diff --git a/v_windows/v/vlib/os/filelock/lib_windows.c.v b/v_windows/v/vlib/os/filelock/lib_windows.c.v
new file mode 100644
index 0000000..56cbace
--- /dev/null
+++ b/v_windows/v/vlib/os/filelock/lib_windows.c.v
@@ -0,0 +1,75 @@
+module filelock
+
+import time
+
+fn C.DeleteFileW(&u16) bool
+fn C.CreateFileW(&u16, u32, u32, voidptr, u32, u32, voidptr) voidptr
+fn C.CloseHandle(voidptr) bool
+
+pub fn (mut l FileLock) unlink() {
+	if l.fd != -1 {
+		C.CloseHandle(l.fd)
+		l.fd = -1
+	}
+	t_wide := l.name.to_wide()
+	C.DeleteFileW(t_wide)
+}
+
+pub fn (mut l FileLock) acquire() ?bool {
+	if l.fd != -1 {
+		// lock already acquired by this instance
+		return false
+	}
+	fd := open(l.name)
+	if fd == -1 {
+		return error('cannot create lock file $l.name')
+	}
+	l.fd = fd
+	return true
+}
+
+pub fn (mut l FileLock) release() bool {
+	if l.fd != -1 {
+		C.CloseHandle(l.fd)
+		l.fd = -1
+		t_wide := l.name.to_wide()
+		C.DeleteFileW(t_wide)
+		return true
+	}
+	return false
+}
+
+pub fn (mut l FileLock) wait_acquire(s int) ?bool {
+	fin := time.now().add(s)
+	for time.now() < fin {
+		if l.try_acquire() {
+			return true
+		}
+		time.sleep(1 * time.millisecond)
+	}
+	return false
+}
+
+fn open(f string) voidptr {
+	f_wide := f.to_wide()
+	// locking it
+	fd := C.CreateFileW(f_wide, C.GENERIC_READ | C.GENERIC_WRITE, 0, 0, C.OPEN_ALWAYS,
+		C.FILE_ATTRIBUTE_NORMAL, 0)
+	if fd == C.INVALID_HANDLE_VALUE {
+		fd == -1
+	}
+	return fd
+}
+
+pub fn (mut l FileLock) try_acquire() bool {
+	if l.fd != -1 {
+		// lock already acquired by this instance
+		return false
+	}
+	fd := open(l.name)
+	if fd == -1 {
+		return false
+	}
+	l.fd = fd
+	return true
+}
-- 
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