//Function handles pipeline command by checking if their is a pipe or otherwise
//passing command to stage
//Parameters are the command and the bkgd value
//returns the status from the command called
int pipelineA(CMD* c, bool bkgd){
if(c->type == PIPE) {
return doPipeline(c, bkgd);
} else {
return stageA(c, bkgd);
}
}
void runAMF(){
for(i = padding; i < row; i++){
for(j = padding; j < col; j++){
// std::cout<< "Alive" << std::endl;
S = Sinit;
stageA();
}
}
}
//Function that executes the pipline command by reseting file descriptors
//so that output of left is passed as input to right
//parameters are the command tree and the boolean for if the left process should
//be backgrounded
//Some of this function comes from pipe.c given in class
int doPipeline(CMD* c, bool bkgd){
int fd[2], // Read and write file descriptors for pipe
pid, status, // Process ID and status of child
pidTwo, statusTwo;
//execute pipe and fork and if either fails, exit
if (pipe(fd) || (pid = fork()) < 0) errorExit (EXIT_FAILURE);
else if (pid == 0) { // Child process
close (fd[0]); // No reading from new pipe
if (fd[1] != 1) { // stdout = write[new pipe]
dup2 (fd[1], 1);
close (fd[1]);
}
exit(pipelineA(c->left, bkgd)); // Overlay by i-th filter
} else {
close(fd[1]); // Parent process
}
//execute a child process for the child
if ((pidTwo = fork()) < 0) errorExit (EXIT_FAILURE);
else if (pidTwo == 0) { // Child process
if(fd[0] != 0){
dup2(fd[0], 0);
close(fd[0]);
}
exit(stageA(c->right, bkgd)); // Overlay by last filter
} else {
close(fd[0]);
//wait to get the status
waitpid(pid, &status, WUNTRACED);
waitpid(pidTwo, &statusTwo, WUNTRACED);
//set status
return (status > 0 && statusTwo == 0) ?
setStatus(status) : setStatus(statusTwo);
}
//reap zombies
pid_t zombie;
while((zombie = waitpid(-1, &status, WNOHANG)) > 0); //reap zombies
return 1;
}
void stageA(){
findZs();
int A1 = zMed - zMin;
int A2 = zMed - zMax;
if(A1 > 0 && A2 < 0){
stageB();
}
else{
S = S + 1;
if(S <= Smax){
stageA();
}
else{
resImage.at<uchar>(i, j) = zMed;
//image.at<uchar>(i, j) = zMed;
}
}
}
