func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid int, handle uintptr, err error) {
	pid, err = forkExec(argv0, argv, attr)
	return pid, 0, err
}

// Implemented in runtime package.
func runtime_BeforeExec()
func runtime_AfterExec()

// execveLibc is non-nil on OS using libc syscall, set to execve in exec_libc.go; this
// avoids a build dependency for other platforms.

// For #41702.
var pendingPreemptSignals atomic.Int32

// Called from syscall package before Exec.
//
//go:linkname syscall_runtime_BeforeExec syscall.runtime_BeforeExec
func syscall_runtime_BeforeExec() {
	// Prevent thread creation during exec.
	execLock.lock()

	// On Darwin, wait for all pending preemption signals to
	// be received. See issue #41702.