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#include <stdlib.h>
#include "thread.h"
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <pthread.h>
Thread::Thread()
: m_read(-1)
, m_write(-1)
, m_threadNum(-1)
, m_parentRead(-1)
, m_parentWrite(-1)
, m_childRead(-1)
, m_childWrite(-1)
, m_numThreads(0)
, m_retVal(NULL)
, m_thread_info(NULL)
{
}
Thread::Thread(int threadNum, const Thread *parent)
: m_read(parent->m_childRead)
, m_write(parent->m_childWrite)
, m_threadNum(threadNum)
, m_parentRead(-1)
, m_parentWrite(-1)
, m_childRead(-1)
, m_childWrite(-1)
, m_numThreads(parent->m_numThreads)
, m_retVal(&parent->m_retVal[threadNum])
, m_thread_info(NULL)
{
}
Thread::~Thread()
{
if(m_threadNum == -1)
{
for(int i = 0; i < m_numThreads; i++)
{
pthread_join(m_thread_info[i], NULL);
}
close(m_parentRead);
close(m_parentWrite);
close(m_childRead);
close(m_childWrite);
delete m_thread_info;
delete m_retVal;
}
}
// for the benefit of this function and the new Thread class it may create
// the Thread class must do nothing of note in it's constructor or it's
// go() member function.
PVOID thread_func(PVOID param)
{
THREAD_DATA *td = (THREAD_DATA *)param;
Thread *thread = td->f->newThread(td->threadNum);
thread->setRetVal(thread->action(td->param));
delete thread;
delete td;
return NULL;
}
void Thread::go(PVOID param, int num)
{
m_numThreads += num;
int control[2];
int feedback[2];
if (pipe(feedback) || pipe(control))
{
fprintf(stderr, "Can't open pipes.\n");
exit(1);
}
m_parentRead = feedback[0];
m_parentWrite = control[1];
m_childRead = control[0];
m_childWrite = feedback[1];
m_read = m_parentRead;
m_write = m_parentWrite;
m_readPoll.events = POLLIN | POLLERR | POLLHUP | POLLNVAL;
m_writePoll.events = POLLOUT | POLLERR | POLLHUP | POLLNVAL;
m_readPoll.fd = m_parentRead;
m_writePoll.fd = m_parentWrite;
pthread_attr_t attr;
if(pthread_attr_init(&attr)
|| pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE)
|| pthread_attr_setstacksize(&attr, 32*1024))
fprintf(stderr, "Can't set thread attributes.\n");
m_retVal = new int[num + 1];
m_thread_info = new pthread_t[num];
for(int i = 1; i <= num; i++)
{
m_retVal[i] = -1;
THREAD_DATA *td = new THREAD_DATA;
td->f = this;
td->param = param;
td->threadNum = i;
int p = pthread_create(&m_thread_info[i - 1], &attr, thread_func, PVOID(td));
if(p)
{
fprintf(stderr, "Can't create a thread.\n");
exit(1);
}
}
if(pthread_attr_destroy(&attr))
fprintf(stderr, "Can't destroy thread attributes.\n");
m_readPoll.fd = m_read;
m_writePoll.fd = m_write;
}
void Thread::setRetVal(int rc)
{
*m_retVal = rc;
}
int Thread::Read(PVOID buf, int size, int timeout)
{
if(timeout)
{
int rc = poll(&m_readPoll, 1, timeout * 1000);
if(rc < 0)
{
fprintf(stderr, "Can't poll read ITC.\n");
return -1;
}
if(!rc)
return 0;
}
if(size != read(m_read, buf, size) )
{
fprintf(stderr, "Can't read data from ITC pipe.\n");
return -1;
}
return size;
}
int Thread::Write(PVOID buf, int size, int timeout)
{
if(timeout)
{
int rc;
do
{
rc = poll(&m_writePoll, 1, timeout * 1000);
if(rc < 0 && errno != EINTR)
{
fprintf(stderr, "Can't poll write ITC.\n");
return -1;
}
} while(rc == -1);
if(!rc)
return 0;
}
if(size != write(m_write, buf, size))
{
fprintf(stderr, "Can't write data to ITC pipe.\n");
return -1;
}
return size;
}
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