Finished nmux, now working on making it compile

ddcd.h

@@ -5,6 +5,7 @@
 #include <string.h>
 #include <getopt.h>
 #include <signal.h>
+#include <unistd.h>
 #include <arpa/inet.h>
 #include <sys/socket.h>
 #include <netinet/in.h>

nmux.cpp

@@ -35,7 +35,7 @@ char host_address[100] = "127.0.0.1";
 int thread_cntr = 0;
 
 //CLI parameters
-int bufsize = 1024; //! currently unused
+int bufsize = 1024; 
 int bufcnt = 1024;
 
 char** global_argv;
@@ -133,6 +133,8 @@ int main(int argc, char* argv[])
 	int new_socket;
 
 	int highfd = 0;
+	int input_fd = STDIN_FILENO;
+	fd_set select_fds;
 	FD_ZERO(&select_fds);
 	FD_SET(listen_socket, &select_fds);
 	maxfd(&highfd, listen_socket);
@@ -150,7 +152,10 @@ int main(int argc, char* argv[])
 	unsigned char* current_write_buffer = pool->get_write_buffer();
 	int index_in_current_write_buffer = 0;
 
-	pthread_cond_t* wait_condition = new pthread_cond_t;
+	//Create wait condition: client threads waiting for input data from the main thread will be
+	//	waiting on this condition. They will be woken up with pthread_cond_broadcast() if new
+	//	data arrives.
+	pthread_cond_t* wait_condition = new pthread_cond_t; 
 	if(!pthread_cond_init(wait_condition, NULL)) 
 		print_exit(MSG_START "pthread_cond_init failed"); //cond_attrs is ignored by Linux
 
@@ -189,7 +194,11 @@ int main(int argc, char* argv[])
 		if(index_in_current_write_buffer >= bufsize)
 		{
 			current_write_buffer = pool->get_write_buffer();
-			pthread_cond_broadcast(wait_condition);
+			pthread_cond_broadcast(wait_condition); 
+				//Shouldn't we do it after we put data in?
+				//	No, on get_write_buffer() actually the previous buffer is getting available 
+				//	for read for threads that wait for new data (wait on pthead mutex 
+				//	client->wait_condition). 
 			index_in_current_write_buffer = 0;
 		}
 		int retval = read(input_fd, current_write_buffer + index_in_current_write_buffer, bufsize - index_in_current_write_buffer);
@@ -199,53 +208,17 @@ int main(int argc, char* argv[])
 		}
 		else if(retval==0)
 		{
-			//!end of input stream, close clients and exit
-			print_exit(MSG_START "end of input, exiting.\n")
+			//End of input stream, close clients and exit
+			print_exit(MSG_START "end of input stream, exiting.\n")
 		}
 	}
 }
 
-#if 0
-for (int i=0; i<clients.size(); i++)
-{
-	if(write(clients[i]->pipefd[1], buf, retval)==-1)
-	{
-
-		if(!clients[i]->error)
-		{
-			print_client(clients[i], "lost buffer, failed to write pipe.");
-			clients[i]->error=1;
-		}
-		//fprintf(stderr, MSG_START "errno is %d\n", errno); //usually 11
-		//int wpstatus;
-		//int wpresult = waitpid(clients[i]->pid, &wpstatus, WNOHANG);
-		//fprintf(stderr, MSG_START "pid is %d\n",clients[i]->pid);
-		//perror("somethings wrong");
-		//if(wpresult == -1) print_client(clients[i], "error while waitpid()!");
-		//else if(wpresult == 0)
-		waitpid(clients[i]->pid, NULL, WNOHANG);
-		if(!proc_exists(clients[i]->pid))
-		{
-			//Client exited!
-			print_client(clients[i], "closing client from main process.");
-			close(clients[i]->pipefd[1]);
-			close(clients[i]->socket);
-			delete clients[i];
-			clients.erase(clients.begin()+i);
-			fprintf(stderr, MSG_START "done closing client from main process.\n");
-		}
-	}
-	else  { if(clients[i]->error) print_client(clients[i], "pipe okay again."); clients[i]->error=0; }
-}
-}
-//TODO: at the end, server closes pipefd[1] for client
-#endif
-
 void client_erase(client_t* client)
 {
 	pthread_mutex_destroy(client->wait_mutex);
 	pthread_cond_destroy(client->wait_condition);
-	pool->
+	pool->remove_thread(client->tsmthread);
 }
 
 void clients_close_all_finished()
@@ -266,30 +239,66 @@ void* client_thread (void* param)
 	this_client->status = CS_THREAD_RUNNING;
 	int retval;
 	tsmpool* lpool = this_client->lpool;
+
+	fd_set client_select_fds;
+	int client_highfd = 0;
+	FD_ZERO(&client_select_fds);
+	FD_SET(client->socket, &client_select_fds);
+	maxfd(&client_highfd, client->socket);
+
+	//Set client->socket to non-blocking
+	if(set_nonblocking(client->socket))
+		error_exit(MSG_START "cannot set_nonblocking() on client->socket");
+
+	int client_buffer_index = 0;
+	char* pool_read_buffer = NULL;
+
 	for(;;)
 	{
-		//wait until there is any data in the tsmpool for me (wait for the server process to wake me up)
-		for(;;)
+		//Wait until there is any data to send.
+		//  If I haven't sent all the data from my last buffer, don't wait.
+		//	(Wait for the server process to wake me up.)
+		while(!pool_read_buffer || client_buffer_index == lpool->size)
 		{
 			char* pool_read_buffer = (char*)lpool->get_read_buffer();
-			if(pool_read_buffer) break;
 			pthread_mutex_lock(&this_client->wait_mutex);
 			this_client->sleeping = 1;
 			pthread_cond_wait(this_client->wait_condition, &this_client->wait_mutex);
 		}
 
-		//wait for the socket to be available for write
-		//read data from server global tsmpool
-		//write data to client socket
-		//have an exit condition
-
+		//Wait for the socket to be available for write.
+		select(highfd, NULL, &client_select_fds, NULL, NULL);
 
+		//Read data from global tsmpool and write it to client socket
+		int ret = send(client->socket, pool_read_buffer + client_buffer_index, lpool->size - client_buffer_index, 0);
+		if(ret == -1) 
+		{
+			switch(errno)
+			{
+				case EAGAIN: break;
+				default: goto client_thread_exit;
+			}
+		}
+		else client_buffer_index += ret;
 	}
+
+client_thread_exit:
 	this_client->status = CS_THREAD_FINISHED;
+	fprintf(stderr, "CS_THREAD_FINISHED"); //Debug
 	pthread_exit(NULL);
 	return NULL;
 }
 
+
+int set_nonblocking(int fd)
+{
+	int flagtmp;
+	if((flagtmp = fcntl(fd, F_GETFL))!=-1)
+		if((flagtmp = fcntl(fd, F_SETFL, flagtmp|O_NONBLOCK))!=-1)
+			return 0;
+	return 1;
+}
+
 void error_exit(const char* why)
 {
 	perror(why); //do we need a \n at the end of (why)?

nmux.h

@@ -1,5 +1,9 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <getopt.h>
+#include <signal.h>
+#include <string.h>
+#include <unistd.h>
 #include <arpa/inet.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
@@ -29,3 +33,12 @@ typedef struct client_s
     pthread_cond_t* wait_condition;
     pthread_mutex_t wait_mutex;
 } client_t;
+
+void print_exit(const char* why);
+void sig_handler(int signo);
+void client_erase(client_t* client);
+void clients_close_all_finished();
+void* client_thread (void* param);
+void error_exit(const char* why);
+void maxfd(int* maxfd, int fd);
+int set_nonblocking(int fd);

tsmpool.cpp

@@ -1,18 +1,24 @@
 #include "tsmpool.h"
 
 tsmpool::tsmpool(size_t size, int num)
+	size(size), 
+	num(num) //number of buffers of (size) to alloc
 {
 	this->threads_cntr = 0;
-	this->size = size;
-	this->num = num; //number of buffers of (size) to alloc
 	this->ok = 1;
 	this->lowest_read_index = -1;
 	this->write_index = 0;
 	this->my_read_index = 0;
-    if (pthread_mutex_init(&this->mutex, NULL) != 0) this->ok=0;
+    if (pthread_mutex_init(&this->mutex, NULL) != 0) { this->ok = 0; return; }
+	for(int i=0; i<num; i++) 
+	{
+		void* newptr = (void*)new char[size];
+		if(!newptr) { this->ok = 0; return; }
+		buffers.push_back(newptr);
+	}
 }
 
-size_t tsmpool::get_size() { return this->size; }
+int tsmpool::is_ok() { return this->ok; }
 
 void* tsmpool::get_write_buffer()
 {

tsmpool.h

@@ -15,19 +15,20 @@ typedef struct tsmthread_s
 class tsmpool
 {
 private:
-	size_t size;
-	int num;
 	vector<tsmthread_t*> threads;
 	vector<void*> buffers;
 	int threads_cntr;
 	pthread_mutex_t mutex;
-	int ok;
+	int ok; //tsmpool is expected to be included in C-style programs. 
+			//	If something fails in the constructor, it will be seen here instead of a try{}catch{}
 	int write_index; //it always points to the next buffer to be written
 	int lowest_read_index; //unused
 	int my_read_index; //it is used when tsmpool is used as a single writer - single reader circular buffer
 
 public:
-	size_t get_size();
+	const size_t size;
+	const int num;
+	int is_ok();
 	tsmpool(size_t size, int num);
 	void* get_write_buffer();
 	tsmthread_t* register_thread();