ACE_Test_and_Set(3)

NAME

ACE_Test_and_Set

SYNOPSIS

#include <ace/Synch_T.h>
template<class ACE_LOCK, class TYPE>
class ACE_Test_and_Set : public ACE_Event_Handler
{
  public:
    ACE_Test_and_Set (TYPE initial_value = 0);
    TYPE is_set (void) const;
    TYPE set (TYPE);
    virtual int handle_signal (
        int signum,
        siginfo_t * = 0,
        ucontext_t * = 0
        );
  private:
    TYPE is_set_;
    ACE_LOCK lock_;
};

TITLE

Implements the classic ``test and set'' operation.

DESCRIPTION

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.

ACE_Test_and_Set (TYPE initial_value = 0);

TYPE is_set (void) const;

Returns true if we are set, else false.

TYPE set (TYPE);

Sets the is_set_ status, returning the original value of is_set_.

virtual int handle_signal (
    int signum,
    siginfo_t * = 0,
    ucontext_t * = 0
    );

Called when object is signaled by OS (either via UNIX signals or when a Win32 object becomes signaled).

AUTHOR

Doug Schmidt

LIBRARY

ace