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-rw-r--r--P3/.vscode/launch.json2
-rw-r--r--P3/server.c129
2 files changed, 73 insertions, 58 deletions
diff --git a/P3/.vscode/launch.json b/P3/.vscode/launch.json
index ef82fe9..5fab37f 100644
--- a/P3/.vscode/launch.json
+++ b/P3/.vscode/launch.json
@@ -9,7 +9,7 @@
"type": "cppdbg",
"request": "launch",
"program": "${workspaceFolder}/web_server",
- "args": ["9000", "testing", "10", "5", "0", "20", "21"],
+ "args": ["9000", "testing", "2", "2", "0", "10", "3"],
"stopAtEntry": false,
"cwd": "${workspaceFolder}",
diff --git a/P3/server.c b/P3/server.c
index 71f120a..7946457 100644
--- a/P3/server.c
+++ b/P3/server.c
@@ -54,7 +54,8 @@ cache_entry_t *dynQ = NULL; //The cache queue
/* ******************** Dynamic Pool Code [Extra Credit A] **********************/
// Extra Credit: This function implements the policy to change the worker thread pool dynamically
// depending on the number of requests
-void *dynamic_pool_size_update(void *arg) {
+void *dynamic_pool_size_update(void *arg)
+{
while (1)
{
// Run at regular intervals
@@ -63,20 +64,22 @@ void *dynamic_pool_size_update(void *arg) {
// Policy: Have clock tracking how long the whole process takes
// If above maxProcessTime -> spawn X workers
// Else if below mostEfficientTime kill all unnecessary threads leaving 1(or 2) of each
- if(total_t > 30) {
+ if (total_t > 30)
+ {
// Threads must be detachable
wID = realloc(wID, (++wIndex) * sizeof(pthread_t));
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
-
+
// Spawn worker threads
- pthread_create(&wID[wIndex-1], &attr, worker, (void *)&wIndex); // Squeaky clean windows!
+ pthread_create(&wID[wIndex - 1], &attr, worker, (void *)&wIndex); // Squeaky clean windows!
char threadName[16];
- sprintf(threadName, "Worker %d", wIndex);
- pthread_setname_np(wID[wIndex-1], threadName);
+ sprintf(threadName, "Worker %d", wIndex);
+ pthread_setname_np(wID[wIndex - 1], threadName);
}
- else if (total_t < 6) {
+ else if (total_t < 6)
+ {
//TODO: Make sure thread isn't doing anything before killing it
pthread_cancel(wID[--wIndex]);
// Need dynamically allocated array of thread ID's so we can cancel the necessary threads
@@ -89,63 +92,65 @@ void *dynamic_pool_size_update(void *arg) {
/* ************************ Cache Code [Extra Credit B] **************************/
// Function to check whether the given request is present in cache
-int isInCache(char *request) {
- /// return the index if the request is present in the cache
+// return the index if the request is present in the cache
+int isInCache(char *request)
+{
cache_entry_t *traverse = dynQ;
if (dynQ == NULL)
return -2;
int index = 0;
- pthread_mutex_lock(&cacheLock);
- while (traverse != NULL) {
+ while (traverse != NULL)
+ {
if (traverse->request == NULL)
break;
- if (!strcmp(request, traverse->request)) {
- pthread_mutex_unlock(&cacheLock);
+ if (!strcmp(request, traverse->request))
+ {
return index;
}
traverse = traverse->next;
index++;
}
- pthread_mutex_unlock(&cacheLock);
return -1;
}
// Function to traverse cache queue to find cache
-int readFromCache(int index, char *buffer) {
+int readFromCache(int index, char *buffer)
+{
cache_entry_t *traverse = dynQ;
- pthread_mutex_lock(&cacheLock);
- for (int i = 0; i < index; i++) {
- if (traverse == NULL) {
- pthread_mutex_unlock(&cacheLock);
+ for (int i = 0; i < index; i++)
+ {
+ if (traverse == NULL)
return -1;
- }
traverse = traverse->next;
}
memcpy(buffer, traverse->content, traverse->len);
- pthread_mutex_unlock(&cacheLock);
return 0;
}
// Function to add the request and its file content into the cache
-void addIntoCache(char *mybuf, char *memory, int memory_size) {
+void addIntoCache(char *mybuf, char *memory, int memory_size)
+{
// It should add the request at an index according to the cache replacement policy
// Make sure to allocate/free memory when adding or replacing cache entries
-
+
cache_entry_t *traverse = dynQ;
if (dynQ == NULL)
return;
bool fullCache = false;
- while (traverse->next != NULL) {
- if (cacheLength > cSiz) {
+ while (traverse->next != NULL)
+ {
+ if (cacheLength >= cSiz)
+ {
fullCache = true;
break;
}
traverse = traverse->next;
}
- pthread_mutex_lock(&cacheLock);
char *silence = (char *)malloc(memory_size + 1);
memcpy(silence, memory, memory_size);
- if (fullCache) {
+ if (fullCache)
+ {
+ //Make temp node to delete oldest member of cache
cache_entry_t *temp = dynQ;
dynQ = dynQ->next;
free(temp->content);
@@ -153,25 +158,30 @@ void addIntoCache(char *mybuf, char *memory, int memory_size) {
free(temp);
free(silence);
cacheLength--;
- pthread_mutex_unlock(&cacheLock);
addIntoCache(mybuf, memory, memory_size);
- } else {
- cache_entry_t *temp = (cache_entry_t*) calloc(1, sizeof(cache_entry_t));
+ }
+ else
+ {
+ cache_entry_t *temp = (cache_entry_t *)calloc(1, sizeof(cache_entry_t));
temp->request = mybuf;
temp->content = silence;
temp->len = memory_size;
- if (cacheLength == 0) {
+ if (cacheLength == 0)
+ {
dynQ = temp;
- } else {
+ }
+ else
+ {
traverse->next = temp;
}
- cacheLength++;;
- pthread_mutex_unlock(&cacheLock);
+ cacheLength++;
+ ;
}
}
// clear the memory allocated to the cache
-void deleteCache() {
+void deleteCache()
+{
request_t *tempReq = NULL;
pthread_mutex_lock(&Qlock);
while (Q != NULL)
@@ -200,9 +210,10 @@ void deleteCache() {
// Function to initialize the cache
-void initCache() {
+void initCache()
+{
// Allocating memory and initializing the cache array
- dynQ = (cache_entry_t *)calloc(1, sizeof(cache_entry_t));
+ dynQ = (cache_entry_t *)malloc(sizeof(cache_entry_t));
cacheLength = 0;
}
@@ -210,7 +221,8 @@ void initCache() {
/* ************************************ Utilities ********************************/
// Function to get the content type from the request
-char *getContentType(char *mybuf) {
+char *getContentType(char *mybuf)
+{
// Should return the content type based on the file type in the request
// (See Section 5 in Project description for more details)
char *ext = strrchr(mybuf, '.');
@@ -258,7 +270,7 @@ long getFileSize(char *file)
// Add necessary arguments as needed
int readFromDisk(char *fileName, char *buffer, long fileSize)
{
- char *temp = (char *)malloc(BUFF_SIZE);
+ char *temp = (char *)malloc(BUFF_SIZE + 1);
sprintf(temp, ".%s", fileName);
// Open and read the contents of file given the request
int requestFile = open(temp, O_RDONLY);
@@ -289,22 +301,22 @@ void *dispatch(void *arg)
// Get request from the client
// Add the request into the queue
- for (int i = 0; i < qLen; i++)
+ for (int i = 0; i < qLen - 1; i++)
{
+
if (traverse == NULL || traverse->next == NULL)
{
//Add things to queue. Lock & unlock to prevent a deadlock
-
request_t *tempNode = (request_t *)malloc(sizeof(request_t));
tempNodeCounter++;
char *dispatchBuf = (char *)malloc(BUFF_SIZE); // Buffer to store the requested filename
if (get_request(newReq, dispatchBuf) != 0)
{
- pthread_mutex_unlock(&Qlock);
free(tempNode);
tempNodeCounter--;
free(dispatchBuf);
- continue; // If get_request fails, try again
+ pthread_mutex_unlock(&Qlock);
+ break; // If get_request fails, ignore the request
}
tempNode->fd = newReq;
tempNode->request = dispatchBuf;
@@ -317,7 +329,6 @@ void *dispatch(void *arg)
{
traverse->next = tempNode;
}
-
pthread_mutex_unlock(&Qlock);
break;
}
@@ -349,8 +360,7 @@ void *worker(void *arg)
continue;
}
start_t = clock();
- //Make copy of request and get rid of old one.
- request_t *request = (request_t *) malloc(sizeof(request_t));
+ request_t *request = (request_t *)malloc(sizeof(request_t));
request->fd = Q->fd;
request->request = Q->request;
Q = Q->next;
@@ -358,32 +368,36 @@ void *worker(void *arg)
//Get the data from the disk or the cache (extra credit B)
numbytes = getFileSize(request->request);
- char *workerBuf = (char *)calloc(numbytes+1, sizeof(char));
+ char *workerBuf = (char *)calloc(numbytes + 1, sizeof(char));
char *bytesError = (char *)malloc(BUFF_SIZE);
bool fail = false;
- if (numbytes != 0) {
+ if (numbytes != 0)
+ {
//SUCC
sprintf(bytesError, "%ld", numbytes);
- } else {
+ }
+ else
+ {
//ERR
fail = true;
sprintf(bytesError, "%s", strerror(errno));
}
char *cacheTest; //HIT/MISS only
- if (!fail) {
+ if (!fail)
+ {
//Make sure nothing is fiddling with cache before fiddling with cache
pthread_mutex_lock(&cacheLock);
- pthread_mutex_unlock(&cacheLock);
-
int test = isInCache(request->request);
if (test != -1)
{
//In cache, file exists
cacheTest = "HIT";
readFromCache(test, workerBuf);
+ pthread_mutex_unlock(&cacheLock);
}
else
{
+ pthread_mutex_unlock(&cacheLock);
cacheTest = "MISS";
if (readFromDisk(request->request, workerBuf, numbytes) == -1)
{
@@ -393,10 +407,11 @@ void *worker(void *arg)
else
{
//Not in cache, disk read succeeds
+ pthread_mutex_lock(&cacheLock);
addIntoCache(request->request, workerBuf, numbytes);
+ pthread_mutex_unlock(&cacheLock);
}
}
-
}
// Log the request into the file and terminal
@@ -424,7 +439,7 @@ void *worker(void *arg)
free(workerBuf);
end_t = clock();
total_t = (double)(end_t - start_t) / CLOCKS_PER_SEC;
- // printf("Total time taken by CPU: %ld\n", total_t);
+ printf("Total time taken by CPU: %ld\n", total_t);
}
return NULL;
}
@@ -441,7 +456,7 @@ static void eggs(int signo)
}
int main(int argc, char **argv)
{
-
+
// Error check on number of arguments
if (argc != 8)
{
@@ -526,8 +541,8 @@ int main(int argc, char **argv)
pthread_setname_np(dThreads[i], threadName);
}
//Create workers (make detachable?????)
- int *Wargs = (int *) malloc(sizeof(int) * workers);
- wID = (pthread_t *) malloc(workers * sizeof(pid_t));
+ int *Wargs = (int *)malloc(sizeof(int) * workers);
+ wID = (pthread_t *)malloc(workers * sizeof(pid_t));
for (int i = 0; i < workers; i++)
{
wIndex++;
generated by cgit v1.2.3 (git 2.46.0) at 2024-11-29 09:17:29 +0000