2.5-18.1

1 files changed, 0 insertions, 152 deletions

diff --git a/linuxthreads/Examples/ex3.c b/linuxthreads/Examples/ex3.c
deleted file mode 100644
index b80b323..0000000
--- a/linuxthreads/Examples/ex3.c
+++ /dev/null
@@ -1,152 +0,0 @@
-/* Multi-thread searching.
-   Illustrates: thread cancellation, cleanup handlers. */
-
-#include <errno.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <pthread.h>
-
-/* Defines the number of searching threads */
-#define NUM_THREADS 5
-
-/* Function prototypes */
-void *search(void *);
-void print_it(void *);
-
-/* Global variables */
-pthread_t threads[NUM_THREADS];
-pthread_mutex_t lock;
-int tries;
-volatile int started;
-
-int main(int argc, char ** argv)
-{
-  int i;
-  int pid;
-
-  /* create a number to search for */
-  pid = getpid();
-  printf("Searching for the number = %d...\n", pid);
-
-  /* Initialize the mutex lock */
-  pthread_mutex_init(&lock, NULL);
-
-  /* Create the searching threads */
-  for (started=0; started<NUM_THREADS; started++)
-    pthread_create(&threads[started], NULL, search, (void *) (long int) pid);
-
-  /* Wait for (join) all the searching threads */
-  for (i=0; i<NUM_THREADS; i++)
-    pthread_join(threads[i], NULL);
-
-  printf("It took %d tries to find the number.\n", tries);
-
-  /* Exit the program */
-  return 0;
-}
-
-/* This is the cleanup function that is called
-   when the threads are cancelled */
-
-void print_it(void *arg)
-{
-  int *try = (int *) arg;
-  pthread_t tid;
-
-  /* Get the calling thread's ID */
-  tid = pthread_self();
-
-  /* Print where the thread was in its search when it was cancelled */
-  printf("Thread %lx was canceled on its %d try.\n", tid, *try);
-}
-
-/* This is the search routine that is executed in each thread */
-
-void *search(void *arg)
-{
-  int num = (long int) arg;
-  int i, j, ntries;
-  pthread_t tid;
-
-  /* get the calling thread ID */
-  tid = pthread_self();
-
-  /* use the thread ID to set the seed for the random number generator */
-  /* Since srand and rand are not thread-safe, serialize with lock */
-
-  /* Try to lock the mutex lock --
-     if locked, check to see if the thread has been cancelled
-     if not locked then continue */
-  while (pthread_mutex_trylock(&lock) == EBUSY)
-    pthread_testcancel();
-
-  srand((int)tid);
-  i = rand() & 0xFFFFFF;
-  pthread_mutex_unlock(&lock);
-  ntries = 0;
-
-  /* Set the cancellation parameters --
-     - Enable thread cancellation
-     - Defer the action of the cancellation */
-
-  pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
-  pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL);
-
-  while (started < NUM_THREADS)
-    sched_yield ();
-
-  /* Push the cleanup routine (print_it) onto the thread
-     cleanup stack.  This routine will be called when the
-     thread is cancelled.  Also note that the pthread_cleanup_push
-     call must have a matching pthread_cleanup_pop call.  The
-     push and pop calls MUST be at the same lexical level
-     within the code */
-
-  /* Pass address of `ntries' since the current value of `ntries' is not
-     the one we want to use in the cleanup function */
-
-  pthread_cleanup_push(print_it, (void *)&ntries);
-
-  /* Loop forever */
-  while (1) {
-    i = (i + 1) & 0xFFFFFF;
-    ntries++;
-
-    /* Does the random number match the target number? */
-    if (num == i) {
-      /* Try to lock the mutex lock --
-         if locked, check to see if the thread has been cancelled
-         if not locked then continue */
-      while (pthread_mutex_trylock(&lock) == EBUSY)
-        pthread_testcancel();
-
-      /* Set the global variable for the number of tries */
-      tries = ntries;
-      printf("Thread %lx found the number!\n", tid);
-
-      /* Cancel all the other threads */
-      for (j=0; j<NUM_THREADS; j++)
-        if (threads[j] != tid) pthread_cancel(threads[j]);
-
-      /* Break out of the while loop */
-      break;
-    }
-
-    /* Every 100 tries check to see if the thread has been cancelled. */
-    if (ntries % 100 == 0) {
-      pthread_testcancel();
-    }
-  }
-
-  /* The only way we can get here is when the thread breaks out
-     of the while loop.  In this case the thread that makes it here
-     has found the number we are looking for and does not need to run
-     the thread cleanup function.  This is why the pthread_cleanup_pop
-     function is called with a 0 argument; this will pop the cleanup
-     function off the stack without executing it */
-
-  pthread_cleanup_pop(0);
-  return((void *)0);
-}