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libzmq/doc/zmq_atomic_counter_value.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_value(3)
===========================
NAME
----
zmq_atomic_counter_value - return value of atomic counter
SYNOPSIS
--------
*int zmq_atomic_counter_value (void *counter);*
DESCRIPTION
-----------
The _zmq_atomic_counter_value_ function returns the value of an atomic
Problem: description of return value is cloned from zmq_atomic_counter_new Solution: provide correct description Fixes #2789
2017-10-21 17:21:00 +02:00
counter created by _zmq_atomic_counter_new()_. This function uses platform
specific atomic operations.
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
RETURN VALUE
------------
Problem: description of return value is cloned from zmq_atomic_counter_new Solution: provide correct description Fixes #2789
2017-10-21 17:21:00 +02:00
The _zmq_atomic_counter_value()_ function returns the value of the
atomic counter. If _counter_ does not point to an atomic counter created by
_zmq_atomic_counter_new()_, the behaviour is undefined.
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
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.
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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_dec[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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