.vscode/settings.json

@@ -5,7 +5,6 @@
         "iostream": "cpp",
         "iosfwd": "cpp",
         "fstream": "cpp",
-        "xlocmes": "cpp",
+        "xlocmes": "cpp"
-        "utility": "cpp"
     }
 }

lab4/src/makefile

@@ -1,14 +1,3 @@
-SHMDIR = sharedMemory
-
-shm_build: $(SHMDIR)/shared.cpp
-	g++ -g $(SHMDIR)/shared.cpp $(SHMDIR)/important.cpp -o $(SHMDIR)/shared.out
-
-shm_run: shm_build
-	$(SHMDIR)/shared.out ../images/$(INPUT).ppm ../images/$(INPUT)_out.ppm 
-
-
-# ----- OLD MAKEFILE CMDs -----------------
-
 build-sharpen: ./a.out
 
 ./a.out: image_sharpener.cpp libppm.cpp

lab4/src/sharedMemory/important.cpp

@@ -6,76 +6,23 @@
 
 using namespace std;
 
-float *S1_smoothen(struct image_t *input_image)
+struct image_t *S1_smoothen(struct image_t *input_image)
 {
+	// cout << input_image->width << input_image->height << " " <<  input_image->image_pixels << endl;
 	int width = input_image->width;
 	int height = input_image->height;
 
 	// memory allocation
-	float *smoother = (float *)malloc(height * width * 3 * sizeof(float));
+	struct image_t *smoother = new struct image_t;
-	long ind = 0;
+	smoother->height = height;
-
+	smoother->width = width;
+	smoother->image_pixels = new uint8_t **[height];
 	for (int i = 0; i < height; i++)
 	{
+		smoother->image_pixels[i] = new uint8_t *[width];
 		for (int j = 0; j < width; j++)
-		{
+			smoother->image_pixels[i][j] = new uint8_t[3];
-			for (int k = 0; k < 3; k++)
-			{
-				//  edge cases
-				if (i == 0 && j == 0)
-				{ // i-1 and j - 1 doesnt exist
-					smoother[ind] = (float)(input_image->image_pixels[i][j][k] / 4 + input_image->image_pixels[i][j + 1][k] / 4 + input_image->image_pixels[i + 1][j][k] / 4 + input_image->image_pixels[i + 1][j + 1][k] / 4);
 	}
-				else if (i == height - 1 && j == 0)
-				{ // i+1 and j-1 does not exist
-					smoother[ind] = (float)(input_image->image_pixels[i - 1][j][k] / 4 + input_image->image_pixels[i - 1][j + 1][k] / 4 + input_image->image_pixels[i][j][k] / 4 + input_image->image_pixels[i][j + 1][k] / 4);
-				}
-
-				else if (i == 0 && j == width - 1)
-				{ // i-1 and j+1 does not exist
-					smoother[ind] = (float)(input_image->image_pixels[i][j - 1][k] / 4 + input_image->image_pixels[i][j][k] / 4 + input_image->image_pixels[i + 1][j - 1][k] / 4 + input_image->image_pixels[i + 1][j][k] / 4);
-				}
-				else if (i == height - 1 && j == width - 1)
-				{ // i+1 and j+1 does not exist
-					smoother[ind] = (float)(input_image->image_pixels[i - 1][j - 1][k] / 4 + input_image->image_pixels[i - 1][j][k] / 4 + input_image->image_pixels[i][j - 1][k] / 4 + input_image->image_pixels[i][j][k] / 4);
-				}
-				else if (i == 0)
-				{ // i - 1 does not exist
-					smoother[ind] = (float)(input_image->image_pixels[i][j - 1][k] / 6 + input_image->image_pixels[i][j][k] / 6 + input_image->image_pixels[i][j + 1][k] / 6 + input_image->image_pixels[i + 1][j - 1][k] / 6 + input_image->image_pixels[i + 1][j][k] / 6 + input_image->image_pixels[i + 1][j + 1][k] / 6);
-				}
-
-				else if (j == 0)
-				{ // j -1 does not exist
-					smoother[ind] = (float)(input_image->image_pixels[i - 1][j][k] / 6 + input_image->image_pixels[i - 1][j + 1][k] / 6 + input_image->image_pixels[i][j][k] / 6 + input_image->image_pixels[i][j + 1][k] / 6 + input_image->image_pixels[i + 1][j][k] / 6 + input_image->image_pixels[i + 1][j + 1][k] / 6);
-				}
-
-				else if (i == height - 1)
-				{ // i+1 does not exist
-					smoother[ind] = (float)(input_image->image_pixels[i - 1][j - 1][k] / 6 + input_image->image_pixels[i - 1][j][k] / 6 + input_image->image_pixels[i - 1][j + 1][k] / 6 + input_image->image_pixels[i][j - 1][k] / 6 + input_image->image_pixels[i][j][k] / 6 + input_image->image_pixels[i][j + 1][k] / 6);
-				}
-				else if (j == width - 1)
-				{ // j + 1 does not exist
-					smoother[ind] = (float)(input_image->image_pixels[i - 1][j - 1][k] / 6 + input_image->image_pixels[i - 1][j][k] / 6 + input_image->image_pixels[i][j - 1][k] / 6 + input_image->image_pixels[i][j][k] / 6 + input_image->image_pixels[i + 1][j - 1][k] / 6 + input_image->image_pixels[i + 1][j][k] / 6);
-				}
-				else
-				{
-					smoother[ind] = (float)(input_image->image_pixels[i - 1][j - 1][k] / 9 + input_image->image_pixels[i - 1][j][k] / 9 + input_image->image_pixels[i - 1][j + 1][k] / 9 + input_image->image_pixels[i][j - 1][k] / 9 + input_image->image_pixels[i][j][k] / 9 + input_image->image_pixels[i][j + 1][k] / 9 + input_image->image_pixels[i + 1][j - 1][k] / 9 + input_image->image_pixels[i + 1][j][k] / 9 + input_image->image_pixels[i + 1][j + 1][k] / 9);
-				}
-				ind++;
-			}
-		}
-	}
-	return smoother;
-}
-
-float *S2_find_details(struct image_t *input_image, float *smoothened_image)
-{
-	// TODO
-	int width = input_image->width;
-	int height = input_image->height;
-
-	float *details = (float *)malloc(height * width * 3 * sizeof(float));
-	long ind = 0;
 
 	for (int i = 1; i < height - 1; i++)
 	{
@@ -83,8 +30,79 @@ float *S2_find_details(struct image_t *input_image, float *smoothened_image)
 		{
 			for (int k = 0; k < 3; k++)
 			{
-				details[ind] = max((float)0, (float)input_image->image_pixels[i][j][k] - smoothened_image[ind]);
+				// image->image_pixels[i][j][k] = val;
-				ind++;
+				//  edge cases
+				if (i == 0 && j == 0)
+				{ // i-1 and j - 1 doesnt exist
+					smoother->image_pixels[i][j][k] = (input_image->image_pixels[i][j][k] / 4 + input_image->image_pixels[i][j + 1][k] / 4 + input_image->image_pixels[i + 1][j][k] / 4 + input_image->image_pixels[i + 1][j + 1][k] / 4);
+				}
+				else if (i == height - 1 && j == 0)
+				{ // i+1 and j-1 does not exist
+					smoother->image_pixels[i][j][k] = (input_image->image_pixels[i - 1][j][k] / 4 + input_image->image_pixels[i - 1][j + 1][k] / 4 + input_image->image_pixels[i][j][k] / 4 + input_image->image_pixels[i][j + 1][k] / 4);
+				}
+
+				else if (i == 0 && j == width - 1)
+				{ // i-1 and j+1 does not exist
+					smoother->image_pixels[i][j][k] = (input_image->image_pixels[i][j - 1][k] / 4 + input_image->image_pixels[i][j][k] / 4 + input_image->image_pixels[i + 1][j - 1][k] / 4 + input_image->image_pixels[i + 1][j][k] / 4);
+				}
+				else if (i == height - 1 && j == width - 1)
+				{ // i+1 and j+1 does not exist
+					smoother->image_pixels[i][j][k] = (input_image->image_pixels[i - 1][j - 1][k] / 4 + input_image->image_pixels[i - 1][j][k] / 4 + input_image->image_pixels[i][j - 1][k] / 4 + input_image->image_pixels[i][j][k] / 4);
+				}
+				else if (i == 0)
+				{ // i - 1 does not exist
+					smoother->image_pixels[i][j][k] = (input_image->image_pixels[i][j - 1][k] / 6 + input_image->image_pixels[i][j][k] / 6 + input_image->image_pixels[i][j + 1][k] / 6 + input_image->image_pixels[i + 1][j - 1][k] / 6 + input_image->image_pixels[i + 1][j][k] / 6 + input_image->image_pixels[i + 1][j + 1][k] / 6);
+				}
+
+				else if (j == 0)
+				{ // j -1 does not exist
+					smoother->image_pixels[i][j][k] = (input_image->image_pixels[i - 1][j][k] / 6 + input_image->image_pixels[i - 1][j + 1][k] / 6 + input_image->image_pixels[i][j][k] / 6 + input_image->image_pixels[i][j + 1][k] / 6 + input_image->image_pixels[i + 1][j][k] / 6 + input_image->image_pixels[i + 1][j + 1][k] / 6);
+				}
+
+				else if (i == height - 1)
+				{ // i+1 does not exist
+					smoother->image_pixels[i][j][k] = (input_image->image_pixels[i - 1][j - 1][k] / 6 + input_image->image_pixels[i - 1][j][k] / 6 + input_image->image_pixels[i - 1][j + 1][k] / 6 + input_image->image_pixels[i][j - 1][k] / 6 + input_image->image_pixels[i][j][k] / 6 + input_image->image_pixels[i][j + 1][k] / 6);
+				}
+				else if (j == width - 1)
+				{ // j + 1 does not exist
+					smoother->image_pixels[i][j][k] = (input_image->image_pixels[i - 1][j - 1][k] / 6 + input_image->image_pixels[i - 1][j][k] / 6 + input_image->image_pixels[i][j - 1][k] / 6 + input_image->image_pixels[i][j][k] / 6 + input_image->image_pixels[i + 1][j - 1][k] / 6 + input_image->image_pixels[i + 1][j][k] / 6);
+				}
+				else
+				{
+					smoother->image_pixels[i][j][k] = (input_image->image_pixels[i - 1][j - 1][k] / 9 + input_image->image_pixels[i - 1][j][k] / 9 + input_image->image_pixels[i - 1][j + 1][k] / 9 + input_image->image_pixels[i][j - 1][k] / 9 + input_image->image_pixels[i][j][k] / 9 + input_image->image_pixels[i][j + 1][k] / 9 + input_image->image_pixels[i + 1][j - 1][k] / 9 + input_image->image_pixels[i + 1][j][k] / 9 + input_image->image_pixels[i + 1][j + 1][k] / 9);
+				}
+			}
+		}
+	}
+
+	return smoother;
+}
+
+struct image_t *S2_find_details(struct image_t *input_image, struct image_t *smoothened_image)
+{
+	// TODO
+	int width = input_image->width;
+	int height = input_image->height;
+
+	struct image_t *details = new struct image_t;
+	details->height = height;
+	details->width = width;
+	details->image_pixels = new uint8_t **[height];
+
+	for (int i = 0; i < height; i++)
+	{
+		details->image_pixels[i] = new uint8_t *[width];
+		for (int j = 0; j < width; j++)
+			details->image_pixels[i][j] = new uint8_t[3];
+	}
+
+	for (int i = 1; i < height - 1; i++)
+	{
+		for (int j = 1; j < width - 1; j++)
+		{
+			for (int k = 0; k < 3; k++)
+			{
+				details->image_pixels[i][j][k] = max(0, input_image->image_pixels[i][j][k] - smoothened_image->image_pixels[i][j][k]);
 			}
 		}
 	}
@@ -92,25 +110,33 @@ float *S2_find_details(struct image_t *input_image, float *smoothened_image)
 	return details;
 }
 
-float *S3_sharpen(struct image_t *input_image, float *details_image)
+struct image_t *S3_sharpen(struct image_t *input_image, struct image_t *details_image)
 {
 	// TODO
 	int width = input_image->width;
 	int height = input_image->height;
 
-	float a = 0.8;
+	int a = 1;
 
-	float *sharp = (float *)malloc(height * width * 3 * sizeof(float));
+	struct image_t *sharp = new struct image_t;
+	sharp->height = height;
+	sharp->width = width;
+	sharp->image_pixels = new uint8_t **[height];
+
+	for (int i = 0; i < height; i++)
+	{
+		sharp->image_pixels[i] = new uint8_t *[width];
+		for (int j = 0; j < width; j++)
+			sharp->image_pixels[i][j] = new uint8_t[3];
+	}
 
-	long ind = 0;
 	for (int i = 1; i < height - 1; i++)
 	{
 		for (int j = 1; j < width - 1; j++)
 		{
 			for (int k = 0; k < 3; k++)
 			{
-				sharp[ind] = min((float)255, (float)input_image->image_pixels[i][j][k] + a * details_image[ind]);
+				sharp->image_pixels[i][j][k] = min(255, input_image->image_pixels[i][j][k] + details_image->image_pixels[i][j][k]) * a;
-				ind++;
 			}
 		}
 	}

lab4/src/sharedMemory/important.h

@@ -9,9 +9,9 @@ struct image_t
 	uint8_t*** image_pixels;
 };
 
-float* S1_smoothen(struct image_t *input_image);
+struct image_t* S1_smoothen(struct image_t *input_image);
-float* S2_find_details(struct image_t *input_image, float *smoothened_image);
+struct image_t* S2_find_details(struct image_t *input_image, struct image_t *smoothened_image);
-float* S3_sharpen(struct image_t *input_image, float *details_image);
+struct image_t* S3_sharpen(struct image_t *input_image, struct image_t *details_image);
 
 struct image_t* read_ppm_file(char* path_to_input_file);
 void write_ppm_file(char* path_to_output_file, struct image_t* image);

lab4/src/sharedMemory/shared.cpp

@@ -18,40 +18,19 @@ using namespace std;
 
 int main(int argc, char *argv[]) {
 
-	if(argc != 3)
+	// if(argc != 3)
-	{
+	// {
-		cout << "usage: ./a.out <path-to-original-image> <path-to-transformed-image>\n\n";
+	// 	cout << "usage: ./a.out <path-to-original-image> <path-to-transformed-image>\n\n";
-		exit(0);
+	// 	exit(0);
-	}
+	// }
 
-    struct image_t *input_image = read_ppm_file(argv[1]);
+    // struct image_t *input_image = read_ppm_file(argv[1]);
-    int height = input_image->height;
-    int width = input_image->width;
-
-    struct image_t *sharpened_image = new struct image_t;
-    sharpened_image->height = height;
-    sharpened_image->width = width;
-    sharpened_image->image_pixels = new uint8_t**[sharpened_image->height];
-    for(int i = 0; i < sharpened_image->height; i++){
-        sharpened_image->image_pixels[i] = new uint8_t*[sharpened_image->width];
-        for(int j = 0; j < sharpened_image->width; j++){
-            sharpened_image->image_pixels[i][j] = new uint8_t[3];
-        }
-    }
-
-    float *sharp;
 
     const char *shm1_name = "/shm_parent_child";
     const char *shm2_name = "/shm_child_grandchild";
     const char *sem1_name = "/sem_parent_child";
     const char *sem2_name = "/sem_child_grandchild";
 
-    size_t size = input_image->height * input_image->width * 3 * sizeof(float);
-    // size_t size = 1024;
-
-    int reps=1000;
-
-    // ---------------------------------------------------------------------------------
     int shm_fd = shm_open(shm1_name, O_CREAT | O_RDWR, 0666);
     if (shm_fd == -1) {
         perror("shm_open");
@@ -65,33 +44,12 @@ int main(int argc, char *argv[]) {
     }
 
     // Map the shared memory object into the process address space
-    float *ptr = (float*)mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0);
+    void *ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0);
     if (ptr == MAP_FAILED) {
         perror("mmap");
         return 1;
     }
 
-    // -----------------------------------------------------------------------------------
-    int shm2_fd = shm_open(shm2_name, O_CREAT | O_RDWR, 0666);
-    if (shm2_fd == -1) {
-        perror("shm_open");
-        return 1;
-    }
-
-    // Resize the shared memory object to the desired size
-    if (ftruncate(shm2_fd, size) == -1) {
-        perror("ftruncate");
-        return 1;
-    }
-
-    // Map the shared memory object into the process address space
-    float *ptr2 = (float*)mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, shm2_fd, 0);
-    if (ptr2 == MAP_FAILED) {
-        perror("mmap");
-        return 1;
-    }
-    // --------------------------------------------------------------------------------------
-
     sem_t *sem_parent_child = sem_open(sem1_name, O_CREAT, 0666, 0); // Initially locked (0)
     sem_t *sem_child_grandchild = sem_open(sem2_name, O_CREAT, 0666, 0); // Initially locked (0)
 
@@ -101,6 +59,9 @@ int main(int argc, char *argv[]) {
     }
 
 
+    // size_t size = input_image->height * input_image->width * 3 * sizeof(uint8_t);
+    size_t size = 1024;
+
 	pid_t CHILD;
 	CHILD = fork();
 	if (CHILD == -1) {
@@ -110,14 +71,37 @@ int main(int argc, char *argv[]) {
 
 	// Parent Process
 	if(CHILD != 0){
+
+        char buffer[1024] = {'p', 'a', 'c', 'k', 'e', 't', '\0'};
+        buffer[7] = '\0';
+
         // Write data to the shared memory
-        for(int i = 0; i < reps; i++){
+        for(int i = 1; i < 5; i++){
+		    // printf("parent writing to shm\n");
+            buffer[6] = '0' + i;
+            memcpy(ptr, buffer, 1024);  // Copy 1024 bytes to shared memory
 
-		    float* smoothImage = S1_smoothen(input_image);
+            // Optional: Print what is being written to shared memory for verification
-            memcpy(ptr, smoothImage, size);
+            printf("P - Writing to shared memory: %s\n", (char *)ptr);
             sem_post(sem_parent_child);
-
+            sem_wait(sem_child_grandchild);
         }
+
+        // Unmap the shared memory object
+        if (munmap(ptr, size) == -1) {
+            perror("munmap");
+            return 1;
+        }
+
+        // Close the shared memory file descriptor
+        if (close(shm_fd) == -1) {
+            perror("close");
+            return 1;
+        }
+
+        sem_close(sem_parent_child);
+        sem_close(sem_child_grandchild);
+		wait(NULL);                /* Wait for child */
 	}
 
 	// Child process
@@ -131,58 +115,68 @@ int main(int argc, char *argv[]) {
 
 		// Child Process
 		if(GRAND_CHILD != 0){
+            int shm_fd = shm_open(shm1_name, O_CREAT | O_RDWR, 0666);
+            if (shm_fd == -1) {
+                perror("shm_open");
+                return 1;
+            }
 
-            for(int i = 0; i < reps; i++){
+            // Resize the shared memory object to the desired size
+            if (ftruncate(shm_fd, size) == -1) {
+                perror("ftruncate");
+                return 1;
+            }
 
+            // Map the shared memory object into the process address space
+            void *ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0);
+            if (ptr == MAP_FAILED) {
+                perror("mmap");
+                return 1;
+            }
+
+            int shm2_fd = shm_open(shm2_name, O_CREAT | O_RDWR, 0666);
+            if (shm2_fd == -1) {
+                perror("shm_open");
+                return 1;
+            }
+
+            // Resize the shared memory object to the desired size
+            if (ftruncate(shm2_fd, size) == -1) {
+                perror("ftruncate");
+                return 1;
+            }
+
+            // Map the shared memory object into the process address space
+            void *ptr2 = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, shm2_fd, 0);
+            if (ptr2 == MAP_FAILED) {
+                perror("mmap");
+                return 1;
+            }
+
+            for(int i=0; i<5; i++){
+                // printf("Child reading from shm1 and writing to shm2...\n");
                 sem_wait(sem_parent_child);
-                float *details = S2_find_details(input_image, ptr);
+                // Print the contents of the shared memory
-                memcpy(ptr2, details, 1024);
+                char *packet = (char *)ptr;
-                sem_post(sem_child_grandchild); // Signal grandchild
+                printf("C - Shared memory contents: %s\n", packet);
-
+                // char buffer[1024];
+                // strncpy(buffer, (char *)ptr, 1024);
+                memcpy(ptr2, ptr, 1024);
+                sem_post(sem_child_grandchild); // Signal parent
             }
-            exit(EXIT_SUCCESS);
-		}
-
-		// GrandChild Process
-		else if (GRAND_CHILD == 0) {
-
-            printf("GC reading...\n");
-            for(int i = 0; i < reps; i++){
-
-                sem_wait(sem_child_grandchild);
-                sharp = S3_sharpen(input_image, ptr2);
-
-            }
-            printf("GC reading done...\n");
-
-            exit(EXIT_SUCCESS);
-		}
-	}
-
-    wait(NULL);
-    wait(NULL);
-
-    int ind=0;
-    for(int i = 0; i < sharpened_image->height; i++){
-        for(int j = 0; j < sharpened_image->width; j++){
-            for(int k = 0; k < 3; k++){
-                sharpened_image->image_pixels[i][j][k] = sharp[ind++];
-            }
-        }
-    }
-    printf("Writing output file...\n");
-    write_ppm_file(argv[2], sharpened_image);
 
             // Unmap the shared memory object
             if (munmap(ptr, size) == -1) {
                 perror("munmap");
                 return 1;
             }
+
             // Close the shared memory file descriptor
             if (close(shm_fd) == -1) {
                 perror("close");
                 return 1;
             }
+			// printf("child writing to shm\n");
 
             // Unmap the shared memory object
             if (munmap(ptr2, size) == -1) {
@@ -197,7 +191,58 @@ int main(int argc, char *argv[]) {
             }
 
             shm_unlink(shm1_name);
+            sem_close(sem_parent_child);
+            sem_close(sem_child_grandchild);
+			wait(NULL);
+			exit(EXIT_SUCCESS);
+		}
+
+		// GrandChild Process
+		else if (GRAND_CHILD == 0) {    /* GrandChild reads from pipe */
+            int shm2_fd = shm_open(shm2_name, O_CREAT | O_RDWR, 0666);
+            if (shm2_fd == -1) {
+                perror("shm_open");
+                return 1;
+            }
+
+            // Resize the shared memory object to the desired size
+            if (ftruncate(shm2_fd, size) == -1) {
+                perror("ftruncate");
+                return 1;
+            }
+
+            // Map the shared memory object into the process address space
+            void *ptr2 = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, shm2_fd, 0);
+            if (ptr2 == MAP_FAILED) {
+                perror("mmap");
+                return 1;
+            }
+
+            for(int i=0; i<5; i++){
+                sem_wait(sem_child_grandchild);
+                // Print the contents of the shared memory
+                // printf("Grandchild reading from shm...\n");
+                printf("GC - Shared memory contents: %s\n", (char *)ptr2);
+            }
+
+            // Unmap the shared memory object
+            if (munmap(ptr2, size) == -1) {
+                perror("munmap");
+                return 1;
+            }
+
+            // Close the shared memory file descriptor
+            if (close(shm2_fd) == -1) {
+                perror("close");
+                return 1;
+            }
+
             shm_unlink(shm2_name);
+			sem_close(sem_parent_child);
+            sem_close(sem_child_grandchild);
+            exit(EXIT_SUCCESS);
+		}
+	}
 
     sem_close(sem_parent_child);
     sem_close(sem_child_grandchild);