compilation problem - variable was not declared in this scope

From:
 psroga@gmail.com
Newsgroups:
comp.lang.c++
Date:
Thu, 05 Jul 2007 15:04:08 -0000
Message-ID:
<1183647848.598555.183920@m36g2000hse.googlegroups.com>
Can anyone look at this code and let me know why pthread_mutex_unlock
and pthread_mutex_lock are giving me the "phtread_mutex_unlock" was
not defined in this scope error.
I am compiling the code on g++.
[root@localhost Stargate_GPS]# g++ -v
Using built-in specs.
Target: i386-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --
infodir=/usr/share/info --enable-shared --enable-threads=posix --
enable-checking=release --with-system-zlib --enable-__cxa_atexit --
disable-libunwind-exceptions --enable-libgcj-multifile --enable-
languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --
disable-dssi --enable-plugin --with-java-home=/usr/lib/jvm/java-1.4.2-
gcj-1.4.2.0/jre --with-cpu=generic --host=i386-redhat-linux
Thread model: posix
gcc version 4.1.1 20070105 (Red Hat 4.1.1-51)

The header file is:
----------------
#ifndef UDP_COMM_H
#define UDP_COMM_H

// General Requirements
#include <iostream>

// UDP requirements
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
// Serial requirements
#include <stdio.h> // Standard input/output definitions
#include <string> // String function definitions
#include <unistd.h> // UNIX standard function definitions
#include <fcntl.h> // File control definitions
#include <termios.h> // POSIX terminal control definitions

#define MAXCOMMBUF 1024
#define MAXWAIT 100

#define GPS_PORT "/dev/tts/0"
#define ROBO_PORT "/dev/tts/2"
#define ROBO_COMM_SIZE 13

// Communications data structure definition
struct commdata {
    char* address;
    char* port;
    pthread_mutex_t inlock, outlock, contlock; // mutex
    int receive;
    int send;
    int stop;
    int insize, outsize;
    char inbuff[MAXCOMMBUF];
    char outbuff[MAXCOMMBUF];
    int fd; //file descriptor
};

using namespace std;

void* commThread(void* arg); // wrapper function for thread function
call
int open_port(commdata* data, int speed);
int open_socket(commdata* data, struct sockaddr_in &read_addr,struct
sockaddr_in &write_addr);

#endif

----------------

The source is:
-------------------
#include "comm.h"

void* commThread(void* arg)
{
    // Comm control variables
    int count = 0;
    int nb, nbytes, outsize;
   fd_set read_template;
    struct timeval wait;

    // Comm thread buffers
    char readbuff[MAXCOMMBUF];
    char writebuff[MAXCOMMBUF];
    for (int i=0;i<MAXCOMMBUF;i++) {
        readbuff[i] = 0;
        writebuff[i] = 0;
    }
    // Thread input pointer
    commdata** data = (commdata**) arg;

    ////////////////////////////////////
    // UDP socket setup
    ////////////////////////////////////
    int sockfd;
    struct sockaddr_in read_addr, write_addr;
    sockfd = open_socket(data[0], read_addr, write_addr);
    if (sockfd < 0) return(NULL);
    cout << "UDP socket now opened" << endl;

    ////////////////////////////////////
    // serial port setup
    ////////////////////////////////////
    int curport[2];

   // opening port with fixed options
    curport[0] = open_port(data[1], B19200);
    if (curport[0] < 0) return(NULL);
    curport[1] = open_port(data[2], B115200);
    if (curport[1] < 0) return(NULL);
    cout << "Serial ports now opened" << endl;

    ////////////////////////////////////
    // Main Loop
    ////////////////////////////////////
    while(1) {

        // Check if thread should quit
        pthread_mutex_lock(&(data[2]->contlock));
        if (data[2]->stop) {
            cout << "Serial thread received exit command" << endl;
            pthread_mutex_unlock(&(data[2]->contlock));
            break;
        }
        pthread_mutex_unlock(&(data[2]->contlock));

     // Check for available packets with timeout
        // set timeout
        wait.tv_sec = 0;
     wait.tv_usec = MAXWAIT;
     // define where to read from
        FD_ZERO(&read_template);
     FD_SET(sockfd, &read_template);
        FD_SET(curport[0], &read_template);
     FD_SET(curport[1], &read_template);

        // Check udp and both serial ports to see if data is available
        if ((nb = select(FD_SETSIZE, &read_template, NULL,NULL, &wait)) >
0) {
            //cout << "Data available:" << FD_ISSET(curport[0],
&read_template) << " " << FD_ISSET(curport[1], &read_template) << " "
<< FD_ISSET(sockfd, &read_template) << endl;
            // Read serial data if available
            for (int i=0;i<2;i++) {
                if (FD_ISSET(curport[i], &read_template)) {
               nbytes = read(curport[i], readbuff, MAXCOMMBUF);
               //cout << "Serial " << i+1 << ": " << nbytes << endl;
                    if (nbytes < 0) {
                        cout << " Read error" << endl;
                        continue;
                    } else if (nbytes > 0) {
                        pthread_mutex_lock(&(data[i+1]->inlock));
                        for (int j=0;j<nbytes;j++) {
                            // Check inbuff overflow
                            if (data[i+1]->insize+j >= MAXCOMMBUF) {
                                data[i+1]->insize = 0;
                                cout << "Serial thread inbuff overflow" << endl;
                            }
                            // Copy readbuff to inbuff
                            data[i+1]->inbuff[data[i+1]->insize+j] = readbuff[j];
                            readbuff[j] = 0;
                        }
                        data[i+1]->insize += nbytes;
                        data[i+1]->receive = 1;
                        pthread_mutex_unlock(&(data[i+1]->inlock));
                    }
                }
            }

            // Read UDP data if available
            if (FD_ISSET(sockfd, &read_template)) {
           nbytes = read(sockfd, readbuff, MAXCOMMBUF);
                if (nbytes < 0) {
                    cout << " Read error" << endl;
                    continue;
                }
                // save received data
                pthread_mutex_lock(&(data[0]->inlock));
                for (int i=0;i<nbytes;i++) {
                    if (data[0]->insize+i >= MAXCOMMBUF) {
                        data[0]->insize = 0;
                        cout << "UDP thread inbuff overflow" << endl;
                    }
                    data[0]->inbuff[data[0]->insize + i] = readbuff[i];
                }
                count++;
                data[0]->insize += nbytes;
                data[0]->receive = 1;
                pthread_mutex_unlock(&(data[0]->inlock));
            }
        }

        // Check if udp packet is ready to send
        pthread_mutex_lock(&(data[0]->outlock));
        if (!(data[0]->send)) {
            pthread_mutex_unlock(&(data[0]->outlock));
        } else {
            // grab data to transmit
            for (int i=0;i<data[0]->outsize;i++) {
                writebuff[i] = data[0]->outbuff[i];
            }
            // reset transmit flag
            outsize = data[0]->outsize;
            data[0]->outsize = 0;
            data[0]->send = 0;
            pthread_mutex_unlock(&(data[0]->outlock));
            // send individual udp packets
            if (sendto(sockfd,writebuff,sizeof(char)*outsize,0,(struct sockaddr
*)&write_addr,sizeof(write_addr)) < 0) {
                cout << "Error Transmitting data packet to ground" << endl;
            }
            // send udp packet to screen
// cout << "UDP Out Packet: " ;
// for (int j=0;j<outsize;j++) {
// cout << (int) writebuff[j] << " ";
// }
// cout << endl;
// cout << "UDP Output size: " << outsize << endl;
        }

        // Check if serial packet is ready to send
        for (int i=0;i<2;i++) {
            pthread_mutex_lock(&(data[i+1]->outlock));
            if (!(data[i+1]->send)) {
                pthread_mutex_unlock(&(data[i+1]->outlock));
            } else {
                // grab data to transmit
                for (int j=0;j<data[i+1]->outsize;j++) {
                    writebuff[j] = data[i+1]->outbuff[j];
                }
                outsize = data[i+1]->outsize;

                // reset transmit flag
                data[i+1]->outsize = 0;
                data[i+1]->send = 0;
                pthread_mutex_unlock(&(data[i+1]->outlock));
                // send serial packet
                nb = write(curport[i], writebuff, outsize*sizeof(char));

// if (i == 1) {
// cout << "Serial out: " ;
// for (int j=0;j<outsize;j++) {
// cout << (int) writebuff[j] << " ";
// if (j>0) {
// if ((writebuff[j-1] ==16) && (writebuff[j]==3)) cout <<
endl;
// }
// }
// cout << endl;
// }
            }
        }
    }
    // Close comm items
    close(sockfd);
    cout << "UDP socket closed, thread terminated" << endl;
    for (int i=0;i<2;i++) {
        close(curport[i]);
    }
    cout << "Serial ports closed, thread terminated" << endl;
    return(NULL);
}

// 'open_port()' - Open serial port.
// Returns the file descriptor on success or -1 on error.
int open_port(commdata* data, int speed)
{
    int fd; // File descriptor for the port
    struct termios options;

    fd = open(data->port, O_RDWR | O_NOCTTY | O_NDELAY);
    if (fd == -1) {
        //Could not open the port.
        perror("open_port: Unable to open serial port - ");
    }
    else {
        // Read currently available data without blocking;
        //fcntl(fd, F_SETFL, FNDELAY);
        // Read currently available data with blocking;
        fcntl(fd, F_SETFL, 0);
    }

    // Get default attributes
    tcgetattr(fd, &options);

    // Clear all default attributes
    bzero(&options,sizeof(options));

    // Enable the receiver and set local mode...
    options.c_cflag = CS8 | CLOCAL | CREAD;

    // Ensure no dumb options are on. Ignore breaks or bytes with parity
errors
    options.c_iflag = IGNBRK|IGNPAR;
    options.c_oflag = 0;
    options.c_lflag = 0; //~(ICANON | ECHO | ECHOE | ISIG); // Set the
new options for the port...

    // Set the baud rates to speed
  cfsetispeed(&options, speed);
    cfsetospeed(&options, speed);

    /*// Set to 8N1
    options.c_cflag &= ~PARENB;
    options.c_cflag &= ~CSTOPB;
    options.c_cflag &= ~CSIZE;
    options.c_cflag |= CS8;
    // Disable flow control
    options.c_cflag &= ~CRTSCTS;
    options.c_iflag &= ~ICRNL;
    options.c_iflag &= ~(IXON | IXOFF | IXANY);

    // Enable the receiver and set local mode...
    options.c_cflag |= (CLOCAL | CREAD);

  // The magical line, turn the port to non-canonical mode so it just
spits data out.
    options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);

    // Setup output options
    options.c_oflag = 0;
    */
    // Set the new options for the port...
    tcsetattr(fd, TCSANOW, &options);
    return (fd);
}

int open_socket(commdata* data, struct sockaddr_in &read_addr,struct
sockaddr_in &write_addr)
{
    int sockfd;
   struct hostent *hp;

    // Open a UDP socket (an Internet datagram socket).
    if ( (sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
        cout << "Unable to open UDP socket" << endl;
  return (sockfd);
    }

    // Setup local address
    bzero((char *) &read_addr, sizeof(read_addr));
   read_addr.sin_family = AF_INET;
    read_addr.sin_addr.s_addr = INADDR_ANY;
    read_addr.sin_port = htons(atoi(data->port));
   if (bind (sockfd, (struct sockaddr *)&read_addr, sizeof(read_addr))
< 0) {
     cout << "Error binding to port " << data->port << endl;
  return (sockfd);
    }

    // Setup remote address
  if ((hp = gethostbyname(data->address)) == 0){
        cout << "Unable to get host by name" << endl;
  return (sockfd);
    }
   bzero((char *) &write_addr, sizeof(write_addr));
   write_addr.sin_family = AF_INET;
   bcopy((char *)hp->h_addr, (char *)&write_addr.sin_addr, hp-

h_length);

   write_addr.sin_port = htons(atoi(data->port));
   return (sockfd);
}

-------------------

The following are the errors:
comm.c: In function 'void* commThread(void*)':
comm.c:50: error: 'pthread_mutex_lock' was not declared in this scope
comm.c:53: error: '::pthread_mutex_unlock' has not been declared
comm.c:56: error: 'pthread_mutex_unlock' was not declared in this
scope

Thanks

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