To be MT-safe, I/O operations defined for a user-defined type that involve a specific ordering of separate operations must be locked to define a critical region. The following example shows a user-defined I/O operation:
#include <rlocks.h> #include <iostream.h> class mystream: public istream { // other definitions... int getRecord(char* name, int& id, float& gpa); }; int mystream::getRecord(char* name, int& id, float& gpa) { stream_locker sl(this, stream_locker::lock_now); *this >> name; *this >> id; *this >> gpa; return this->fail() == 0; } |