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win, util: optimize the performance of uv_os_getppid (#4512)

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uv_os_getppid uses CreateToolhelp32Snapshot to enumerate
processes and find the parent process PID.However,
CreateToolhelp32Snapshot has poor performance.Use uv_once
to improve performance.
This commit is contained in:
Zuohui Yang 2024-08-21 14:29:03 +08:00 committed by GitHub
parent 76f7fb26b9
commit 4d45a9a652
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GPG Key ID: B5690EEEBB952194
1 changed files with 10 additions and 2 deletions
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12
src/win/util.c
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@ -75,6 +75,10 @@ static CRITICAL_SECTION process_title_lock;
/* Frequency of the high-resolution clock. */
static uint64_t hrtime_frequency_ = 0;
/* Cache parent pid to optimize performance */
static uv_once_t parent_pid_init_guard = UV_ONCE_INIT;
static int parent_pid = -1;
/*
* One-time initialization code for functionality defined in util.c.
@ -317,8 +321,7 @@ uv_pid_t uv_os_getpid(void) {
}
uv_pid_t uv_os_getppid(void) {
int parent_pid = -1;
static void uv__init_ppid(void) {
HANDLE handle;
PROCESSENTRY32 pe;
DWORD current_pid = GetCurrentProcessId();
@ -336,6 +339,11 @@ uv_pid_t uv_os_getppid(void) {
}
CloseHandle(handle);
}
uv_pid_t uv_os_getppid(void) {
uv_once(&parent_pid_init_guard, uv__init_ppid);
return parent_pid;
}