1 files changed, 0 insertions, 107 deletions
diff --git a/test/pthread/ex4.c b/test/pthread/ex4.c
deleted file mode 100644
index cf4cf1d69..000000000
--- a/test/pthread/ex4.c
+++ /dev/null
@@ -1,107 +0,0 @@
-/* Making a library function that uses static variables thread-safe.
-   Illustrates: thread-specific data, pthread_once(). */
-
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <pthread.h>
-
-/* This is a typical example of a library function that uses
-   static variables to accumulate results between calls.
-   Here, it just returns the concatenation of all string arguments
-   that were given to it. */
-
-#if 0
-
-static char * str_accumulate(char * s)
-{
-  static char accu[1024] = { 0 };
-  strcat(accu, s);
-  return accu;
-}
-
-#endif
-
-/* Of course, this cannot be used in a multi-threaded program
-   because all threads store "accu" at the same location.
-   So, we'll use thread-specific data to have a different "accu"
-   for each thread. */
-
-/* Key identifying the thread-specific data */
-static pthread_key_t str_key;
-/* "Once" variable ensuring that the key for str_alloc will be allocated
-   exactly once. */
-static pthread_once_t str_alloc_key_once = PTHREAD_ONCE_INIT;
-
-/* Forward functions */
-static void str_alloc_key(void);
-static void str_alloc_destroy_accu(void * accu);
-
-/* Thread-safe version of str_accumulate */
-
-static char * str_accumulate(const char * s)
-{
-  char * accu;
-
-  /* Make sure the key is allocated */
-  pthread_once(&str_alloc_key_once, str_alloc_key);
-  /* Get the thread-specific data associated with the key */
-  accu = (char *) pthread_getspecific(str_key);
-  /* It's initially NULL, meaning that we must allocate the buffer first. */
-  if (accu == NULL) {
-    accu = malloc(1024);
-    if (accu == NULL) return NULL;
-    accu[0] = 0;
-    /* Store the buffer pointer in the thread-specific data. */
-    pthread_setspecific(str_key, (void *) accu);
-    printf("Thread %lx: allocating buffer at %p\n", pthread_self(), accu);
-  }
-  /* Now we can use accu just as in the non thread-safe code. */
-  strcat(accu, s);
-  return accu;
-}
-
-/* Function to allocate the key for str_alloc thread-specific data. */
-
-static void str_alloc_key(void)
-{
-  pthread_key_create(&str_key, str_alloc_destroy_accu);
-  printf("Thread %lx: allocated key %d\n", pthread_self(), str_key);
-}
-
-/* Function to free the buffer when the thread exits. */
-/* Called only when the thread-specific data is not NULL. */
-
-static void str_alloc_destroy_accu(void * accu)
-{
-  printf("Thread %lx: freeing buffer at %p\n", pthread_self(), accu);
-  free(accu);
-}
-
-/* Test program */
-
-static void * process(void * arg)
-{
-  char * res;
-  res = str_accumulate("Result of ");
-  res = str_accumulate((char *) arg);
-  res = str_accumulate(" thread");
-  printf("Thread %lx: \"%s\"\n", pthread_self(), res);
-  return NULL;
-}
-
-int main(int argc, char ** argv)
-{
-  char * res;
-  pthread_t th1, th2;
-
-  res = str_accumulate("Result of ");
-  pthread_create(&th1, NULL, process, (void *) "first");
-  pthread_create(&th2, NULL, process, (void *) "second");
-  res = str_accumulate("initial thread");
-  printf("Thread %lx: \"%s\"\n", pthread_self(), res);
-  pthread_join(th1, NULL);
-  pthread_join(th2, NULL);
-  exit(0);
-}