Thread.create funct arg creates a new thread of control,
in which the function application
is executed concurrently with the other threads of the program.
The application of
returns the handle of the newly created thread.
The new thread terminates when the application
returns, either normally or by raising an uncaught exception.
In the latter case, the exception is printed on standard error,
but not propagated back to the parent thread. Similarly, the
result of the application
funct arg is discarded and not
directly accessible to the parent thread.
Return the thread currently executing.
Return the identifier of the given thread. A thread identifier is an integer that identifies uniquely the thread. It can be used to build data structures indexed by threads.
Terminate prematurely the thread whose handle is given. This functionality is available only with bytecode-level threads.
delay d suspends the execution of the calling thread for
d seconds. The other program threads continue to run during
join th suspends the execution of the calling thread
until the thread
th has terminated.
Suspend the execution of the calling thread until at least
one character is available for reading (Thread.wait_read) or
one character can be written without blocking (
on the given Unix file descriptor.
Same as Thread.wait_read and Thread.wait_write, but wait for at most
the amount of time given as second argument (in seconds).
true if the file descriptor is ready for input/output
false if the timeout expired.
Re-schedule the calling thread without suspending it. This function can be used to give scheduling hints, telling the scheduler that now is a good time to switch to other threads.
Signal handling follows the POSIX thread model: signals generated by a thread are delivered to that thread; signals generated externally are delivered to one of the threads that does not block it. Each thread possesses a set of blocked signals, which can be modified using Thread.sigmask. This set is inherited at thread creation time. Per-thread signal masks are supported only by the system thread library under Unix, but not under Win32, nor by the VM thread library.
sigmask cmd sigs changes the set of blocked signals for the
`Set, blocked signals are set to those in
`Block, the signals in
sigs are added to
the set of blocked signals.
`Unblock, the signals in
sigs are removed
from the set of blocked signals.
sigmask returns the set of previously blocked signals for the thread.
wait_signal sigs suspends the execution of the calling thread
until the process receives one of the signals specified in the
sigs. It then returns the number of the signal received.
Signal handlers attached to the signals in
sigs will not
be invoked. The signals
sigs are expected to be blocked before
Jane Street extensions
true iff Thread.create has ever been called, even if there is
currently only one running thread.
num_threads () attempts to return the number of currently running
threads by parsing /proc. Since this is an operation frought with
potential failure, we return an option in cases of failure