pvac::detail::CallbackStorage Struct Reference

#include "clientpvt.h"

Inheritance diagram for pvac::detail::CallbackStorage:

Collaboration diagram for pvac::detail::CallbackStorage:

Public Member Functions
	CallbackStorage ()

Public Attributes
epicsMutex	mutex
epicsEvent	wakeup
size_t	nwaitcb
epicsThreadId	incb

Detailed Description

Safe use of raw callback pointer while unlocked. clear pointer and then call CallbackGuard::wait() to ensure that concurrent callback have completed.

Prototype usage

struct mycb : public CallbackStorage {
     void (*ptr)();
};
// make a callback
void docb(mycb& cb) {
    CallbackGuard G(cb); // lock
    // decide whether to make CB
    if(ptr){
         void (*P)() = ptr; // copy for use while unlocked
         CallbackUse U(G); // unlock
         (*P)();
         // automatic re-lock
    }
    // automatic final unlock
}
void cancelop(mycb& cb) {
    CallbackGuard G(cb);
    ptr = 0;  // prevent further callbacks from starting
    G.wait(); // wait for inprogress callbacks to complete
}

Definition at line 117 of file clientpvt.h.

Constructor & Destructor Documentation

pvac::detail::CallbackStorage::CallbackStorage ( )

inline

Definition at line 122 of file clientpvt.h.

:nwaitcb(0u), incb(0) {}

Member Data Documentation

epicsThreadId pvac::detail::CallbackStorage::incb

Definition at line 121 of file clientpvt.h.

epicsMutex pvac::detail::CallbackStorage::mutex

mutable

Definition at line 118 of file clientpvt.h.

size_t pvac::detail::CallbackStorage::nwaitcb

Definition at line 120 of file clientpvt.h.

epicsEvent pvac::detail::CallbackStorage::wakeup

Definition at line 119 of file clientpvt.h.

---

The documentation for this struct was generated from the following file:

• modules/pvAccess/src/client/clientpvt.h