// all Ms.
var perThreadSyscall perThreadSyscallArgs

// syscall_runtime_doAllThreadsSyscall and executes a specified system call on
// all Ms.
//
// The system call is expected to succeed and return the same value on every
// thread. If any threads do not match, the runtime throws.
//
//go:linkname syscall_runtime_doAllThreadsSyscall syscall.runtime_doAllThreadsSyscall
//go:uintptrescapes

//sys	Sethostname(p []byte) (err error)
//sysnb	Setpgid(pid int, pgid int) (err error)
//sysnb	Setsid() (pid int, err error)
//sysnb	Settimeofday(tv *Timeval) (err error)

// Provided by runtime.syscall_runtime_doAllThreadsSyscall which stops the
// world and invokes the syscall on each OS thread. Once this function returns,
// all threads are in sync.
//
//go:uintptrescapes