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libzmq/doc/zmq_atomic_counter_dec.txt

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Problem: need atomic reference counting in several projects Solution: as libzmq already provides this across all platforms, expose an atomic counter API. I've not wrapped atomic pointers, though someone who needs this may want to do so.
2014-12-23 01:14:38 +01:00
zmq_atomic_counter_dec(3)
=========================
NAME
----
zmq_atomic_counter_dec - decrement an atomic counter
SYNOPSIS
--------
Problem: 'bool' is not defined by default zmq_atomic_counter_dec returned a 'bool' value, yet this isn't defined by standard, so causes compile errors in upstream code. Solution: return an int that can be safely converted to bool if needed by bindings.
2014-12-23 15:20:10 +01:00
*int zmq_atomic_counter_dec (void *counter);*
Problem: need atomic reference counting in several projects Solution: as libzmq already provides this across all platforms, expose an atomic counter API. I've not wrapped atomic pointers, though someone who needs this may want to do so.
2014-12-23 01:14:38 +01:00
DESCRIPTION
-----------
The _zmq_atomic_counter_dec_ function decrements an atomic counter in
a threadsafe fashion. This function uses platform specific atomic
operations.
RETURN VALUE
------------
Problem: 'bool' is not defined by default zmq_atomic_counter_dec returned a 'bool' value, yet this isn't defined by standard, so causes compile errors in upstream code. Solution: return an int that can be safely converted to bool if needed by bindings.
2014-12-23 15:20:10 +01:00
The _zmq_atomic_counter_dec()_ function returns 1 if the counter is
greater than zero after decrementing, or zero if the counter reached
Problem: need atomic reference counting in several projects Solution: as libzmq already provides this across all platforms, expose an atomic counter API. I've not wrapped atomic pointers, though someone who needs this may want to do so.
2014-12-23 01:14:38 +01:00
zero.
EXAMPLE
-------
.Test code for atomic counters
----
void *counter = zmq_atomic_counter_new ();
assert (zmq_atomic_counter_value (counter) == 0);
assert (zmq_atomic_counter_inc (counter) == 0);
assert (zmq_atomic_counter_inc (counter) == 1);
assert (zmq_atomic_counter_inc (counter) == 2);
assert (zmq_atomic_counter_value (counter) == 3);
Problem: 'bool' is not defined by default zmq_atomic_counter_dec returned a 'bool' value, yet this isn't defined by standard, so causes compile errors in upstream code. Solution: return an int that can be safely converted to bool if needed by bindings.
2014-12-23 15:20:10 +01:00
assert (zmq_atomic_counter_dec (counter) == 1);
assert (zmq_atomic_counter_dec (counter) == 1);
assert (zmq_atomic_counter_dec (counter) == 0);
Problem: need atomic reference counting in several projects Solution: as libzmq already provides this across all platforms, expose an atomic counter API. I've not wrapped atomic pointers, though someone who needs this may want to do so.
2014-12-23 01:14:38 +01:00
zmq_atomic_counter_set (counter, 2);
Problem: 'bool' is not defined by default zmq_atomic_counter_dec returned a 'bool' value, yet this isn't defined by standard, so causes compile errors in upstream code. Solution: return an int that can be safely converted to bool if needed by bindings.
2014-12-23 15:20:10 +01:00
assert (zmq_atomic_counter_dec (counter) == 1);
assert (zmq_atomic_counter_dec (counter) == 0);
Problem: need atomic reference counting in several projects Solution: as libzmq already provides this across all platforms, expose an atomic counter API. I've not wrapped atomic pointers, though someone who needs this may want to do so.
2014-12-23 01:14:38 +01:00
zmq_atomic_counter_destroy (&counter);
Problem: 'bool' is not defined by default zmq_atomic_counter_dec returned a 'bool' value, yet this isn't defined by standard, so causes compile errors in upstream code. Solution: return an int that can be safely converted to bool if needed by bindings.
2014-12-23 15:20:10 +01:00
return 0;
Problem: need atomic reference counting in several projects Solution: as libzmq already provides this across all platforms, expose an atomic counter API. I've not wrapped atomic pointers, though someone who needs this may want to do so.
2014-12-23 01:14:38 +01:00
----
SEE ALSO
--------
linkzmq:zmq_atomic_counter_new[3]
linkzmq:zmq_atomic_counter_set[3]
linkzmq:zmq_atomic_counter_inc[3]
linkzmq:zmq_atomic_counter_value[3]
linkzmq:zmq_atomic_counter_destroy[3]
AUTHORS
-------
This page was written by the 0MQ community. To make a change please
read the 0MQ Contribution Policy at <http://www.zeromq.org/docs:contributing>.
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