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35 .Nd send signal to thread
41 .Fn thr_kill "long id" "int sig"
43 .Fn thr_kill2 "pid_t pid" "long id" "int sig"
49 system calls allow sending a signal, specified by the
51 argument, to some threads in a process.
54 function, signalled threads are always limited to the current process.
59 argument specifies the process with threads to be signalled.
63 argument specifies which threads get the signal.
66 is equal to \-1, all threads in the specified process are signalled.
67 Otherwise, only the thread with the thread identifier equal to the
68 argument is signalled.
72 argument defines the delivered signal.
73 It must be a valid signal number or zero.
74 In the latter case no signal is actually sent, and the call is used to
75 verify the liveness of the thread.
77 The signal is delivered with
87 will return zero, otherwise \-1 is returned, and
89 is set to indicate the error.
95 operations return the following errors:
100 argument is not zero and does not specify valid signal.
102 The specified process or thread was not found.
107 may return the following errors:
110 The current process does not have sufficient privilege to check existence or
111 send a signal to the specified process.
127 system calls are non-standard and are used by the
138 system calls first appeared in