diff options
author | Waldemar Brodkorb <wbx@uclibc-ng.org> | 2016-10-28 20:29:21 +0200 |
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committer | Waldemar Brodkorb <wbx@uclibc-ng.org> | 2016-10-28 20:31:55 +0200 |
commit | 99ef2719fb3d703fe38c4113cd7f5adec516dd3a (patch) | |
tree | 2c1f77cb41b60ccbf8faa77a3640491a3546b546 /test/pthread/ex4.c | |
parent | 543308f6c46cf2edf8a524bc9c631e472570fe72 (diff) |
test: remove test suite
The test suite is now a developed in a separate git repository.
See here:
http://cgit.uclibc-ng.org/cgi/cgit/uclibc-ng-test.git
The test suite should be just like every other software compiled
with the cross-toolchain. In the past strange problems where found
when the test suite got build in the toolchain creation step.
Diffstat (limited to 'test/pthread/ex4.c')
-rw-r--r-- | test/pthread/ex4.c | 107 |
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); -} |