Fire a callback when the specified signal is received. Note that there is a tiny delay between the time this call returns and the signal is actually handled by this library. It is likely that, if the signal was received the instant the call returned, it will be lost (this is normally not an issue, since you would call this in your startup code anyway)
signum The signal to receive. The following signals are not allowed: SIGKILL, SIGSEGV, SIGABRT, SIGBUS, SIGFPE, SIGILL, SIGIOT, SIGPIPE, SIGEMT, SIGSYS, SIGTRAP, SIGSTOP, SIGCONT, and SIGWAITING
persist If GLOBUS_TRUE, keep this callback registered for multiple signals. If GLOBUS_FALSE, the signal handler will automatically be unregistered once the signal has been received.
callback_func the user func to call when a signal is received
callback_user_arg user arg that will be passed to callback
space the space to deliver callbacks to.
Unregister a signal handling callback. Parameters:
signum The signal to unregister.
unregister_callback the function to call when the callback has been canceled and there are no running instances of it (may be NULL). This will be delivered to the same space used in the register call.
unreg_arg user arg that will be passed to callback
GLOBUS_CALLBACK_ERROR_INVALID_ARGUMENT if this signal was registered with persist == false, then there is a race between a signal actually being caught and therefor automatically unregistered and the attempt to manually unregister it. If that race occurs, you will receive this error just as you would for any signal not registered.
Register a wakeup handler with callback library. This is really only needed in non-threaded builds, but for cross builds should be used everywhere that a callback may sleep for an extended period of time.
An example use is for an io poller that sleeps indefinitely on select(). If the callback library receives a signal that it needs to deliver asap, it will call the wakeup handler(s), These wakeup handlers must run as though they were called from a signal handler (don't use any thread utilities). The io poll example will likely write a single byte to a pipe that select() is monitoring.
This handler will not be unregistered until the callback library is deactivated (via common).
wakeup function to call when callback library needs you to return asap from any blocked callbacks.
user_arg user data that will be passed along in the wakeup handler
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