Implements the classic ``test and set'' operation. More...
#include <Test_and_Set.h>
Public Member Functions | |
ACE_Test_and_Set (TYPE initial_value=0) | |
TYPE | is_set (void) const |
Returns true if we are set, else false. | |
TYPE | set (TYPE) |
virtual int | handle_signal (int signum, siginfo_t *=0, ucontext_t *=0) |
Private Attributes | |
TYPE | is_set_ |
Keeps track of our state. | |
ACE_LOCK | lock_ |
Protect the state from race conditions. |
Implements the classic ``test and set'' operation.
This class keeps track of the status of <is_set_>, which can be set based on various events (such as receipt of a signal). This class is derived from ACE_Event_Handler so that it can be "signaled" by a Reactor when a signal occurs. We assume that <TYPE> is a data type that can be assigned the value 0 or 1.
Definition at line 38 of file Test_and_Set.h.
ACE_Test_and_Set< ACE_LOCK, TYPE >::ACE_Test_and_Set | ( | TYPE | initial_value = 0 |
) |
Definition at line 16 of file Test_and_Set.cpp.
: is_set_ (initial_value) { }
int ACE_Test_and_Set< ACE_LOCK, TYPE >::handle_signal | ( | int | signum, | |
siginfo_t * | = 0 , |
|||
ucontext_t * | = 0 | |||
) | [virtual] |
Called when object is signaled by OS (either via UNIX signals or when a Win32 object becomes signaled).
Reimplemented from ACE_Event_Handler.
Definition at line 40 of file Test_and_Set.cpp.
{ // By setting this to 1, we are "signaling" to anyone calling // <is_set> or or <set> that the "test and set" object is in the // "signaled" state, i.e., it's "available" to be set back to 0. this->set (1); return 0; }
TYPE ACE_Test_and_Set< ACE_LOCK, TYPE >::is_set | ( | void | ) | const |
Returns true if we are set, else false.
Definition at line 23 of file Test_and_Set.cpp.
{ ACE_GUARD_RETURN (ACE_LOCK, ace_mon, (ACE_LOCK &) this->lock_, this->is_set_); return this->is_set_; }
TYPE ACE_Test_and_Set< ACE_LOCK, TYPE >::set | ( | TYPE | status | ) |
Sets the <is_set_> status, returning the original value of <is_set_>.
Definition at line 31 of file Test_and_Set.cpp.
{ ACE_GUARD_RETURN (ACE_LOCK, ace_mon, this->lock_, this->is_set_); TYPE o_status = this->is_set_; this->is_set_ = status; return o_status; }
TYPE ACE_Test_and_Set< ACE_LOCK, TYPE >::is_set_ [private] |
Keeps track of our state.
Definition at line 58 of file Test_and_Set.h.
ACE_LOCK ACE_Test_and_Set< ACE_LOCK, TYPE >::lock_ [private] |
Protect the state from race conditions.
Definition at line 61 of file Test_and_Set.h.