/**
* Common framework for page replacement, with divergent functions
* broken out.
*/
void replacePages(const char *refString, int frameCount, char *frameReport, void (*initPageReplacement)(void),
void (*servicePageFault)(int), int (*getVictimPage)(int *, int), void (*usePage)(int), void (*cleanUp)(void)) {
// The simulated physical memory.
int frames[frameCount];
initializeFrames(frames, frameCount);
// Initialize the frame report.
strncpy(frameReport, "", 1);
// *** Initialize any needed page replacement data structures.
initPageReplacement();
// Iterate through the reference string.
int currentReference = 0;
int referenceCount = strlen(refString);
while (currentReference < referenceCount) {
// First, report on the current state of things.
appendFrameState(frames, frameCount, frameReport);
// Grab the page reference and see if it's in memory.
int page = getReference(refString, currentReference);
if (getPageFrame(page, frames, frameCount) == -1) {
// *** Page fault; fetch the page.
servicePageFault(page);
// Allocate a frame.
int frame = getAvailableFrame(frames, frameCount);
if (frame == -1) {
// *** Not enough frames; replace a page.
int victim = getVictimPage(frames, frameCount);
frame = getPageFrame(victim, frames, frameCount);
}
frames[frame] = page;
}
// *** "Access" the page.
usePage(page);
// Move to the next reference.
currentReference++;
}
// Issue one last report, and conclude it.
appendFrameState(frames, frameCount, frameReport);
finishFrameReport(frameReport);
// *** Perform any necessary clean-up.
cleanUp();
}
int main(void)
{
// open input file.
printf("Enter input file name :\n");
scanf("%s", gStrBuf);
printf("\n");
gInOutFile = fopen(gStrBuf, "r");
if(gInOutFile != NULL) {
printf("File : %s opened success.\n", gStrBuf);
} // end if
else {
printf("File : %s could not be opened, or not exists.\n", gStrBuf);
printf("Program terminated.\n");
return 0;
} // end else
// Get page frame value
getPageFrame();
printf("Page frame : %d\n", gPageFrame);
// Get page request
getPageRequest();
// print out page request
printf("Page request : ");
for(int CNT = 0; gPageRequest[CNT] != END_SIGN; CNT++)
printf("%d ", gPageRequest[CNT]);
printf("\n");
// Close input file
fclose(gInOutFile);
// Declaration memory page reference
MEM_REF* memoryPage = (MEM_REF*) malloc(sizeof(MEM_REF) * gPageFrame);
// Initial memory page
initMemPage(memoryPage);
// Output memory page and information
outMemPage(0, memoryPage);
printf("\n");
outMemInf();
// Reset memory information and memory page
clearMemInf();
initMemPage(memoryPage);
// Method First In First Out
printf("----- First In First Out -------------\n");
FIFO(memoryPage);
outMemInf();
return 0;
} // END main
