Created
February 15, 2016 18:54
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| #!/bin/bash | |
| str="aaaaaaaaaaaaaaaaaa"; | |
| while true; do | |
| if [ "$str" = "aaaaaaaaaaaaaaaaaa" ]; then | |
| str="bbbbbbbbbbbbbbbbbbbbb" | |
| else | |
| str="aaaaaaaaaaaaaaaaaa" | |
| fi | |
| echo "$str | |
| $str | |
| $str" > /dev/shm/test.tmp | |
| mv /dev/shm/test.tmp /dev/shm/test | |
| done |
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| #include <apr_file_io.h> | |
| #include <apr_pools.h> | |
| #include <apr_strings.h> | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <apr_thread_proc.h> | |
| #include <apr_thread_mutex.h> | |
| static void _remove_lineends(char *str) { | |
| if(str) { | |
| size_t len = strlen(str); | |
| while(len>0) { | |
| if(str[len-1] == '\n' || str[len-1] == '\r') { | |
| str[len-1] = '\0'; | |
| len--; | |
| } else { | |
| break; | |
| } | |
| } | |
| } | |
| } | |
| static void* APR_THREAD_FUNC work_thread(apr_thread_t *thread, void *data) { | |
| apr_pool_t *pool; | |
| apr_file_t *f; | |
| apr_pool_create(&pool,NULL); | |
| while(1) { | |
| int rv; | |
| char *line1=NULL,*line2=NULL,*line3=NULL; | |
| char line[1024]; | |
| rv = apr_file_open(&f, "/dev/shm/test", | |
| APR_FOPEN_READ|APR_FOPEN_BUFFERED|APR_FOPEN_BINARY,APR_OS_DEFAULT, | |
| pool); | |
| if(rv != APR_SUCCESS) { | |
| char errmsg[120]; | |
| printf("failed to open file %s\n",apr_strerror(rv,errmsg,120)); | |
| exit(1); | |
| } | |
| if( (rv = apr_file_gets(line,1024,f))== APR_SUCCESS) { | |
| _remove_lineends(line); | |
| line1 = apr_pstrdup(pool,line); | |
| } | |
| if( (rv = apr_file_gets(line,1024,f))== APR_SUCCESS) { | |
| _remove_lineends(line); | |
| line2 = apr_pstrdup(pool,line); | |
| } | |
| if( (rv = apr_file_gets(line,1024,f))== APR_SUCCESS) { | |
| _remove_lineends(line); | |
| line3 = apr_pstrdup(pool,line); | |
| } | |
| apr_file_close(f); | |
| if(!line1||!line2||!line3) { | |
| printf("one line was NULL\n"); | |
| exit(1); | |
| } | |
| if(strcmp(line1,line2)||strcmp(line1,line3)) { | |
| printf("one line does not match\n"); | |
| exit(1); | |
| } | |
| apr_pool_clear(pool); | |
| } | |
| } | |
| int main(int argc, char **argv) { | |
| apr_thread_t **threads; | |
| int nthreads=128,n; | |
| apr_status_t rv; | |
| apr_threadattr_t *thread_attrs; | |
| apr_pool_t *pool; | |
| apr_initialize(); | |
| apr_pool_create(&pool,NULL); | |
| apr_threadattr_create(&thread_attrs, pool); | |
| threads = (apr_thread_t**)apr_pcalloc(pool, nthreads*sizeof(apr_thread_t*)); | |
| for(n=0; n<nthreads; n++) { | |
| apr_thread_create(&threads[n], thread_attrs, work_thread, NULL, pool); | |
| } | |
| for(n=0; n<nthreads; n++) { | |
| apr_thread_join(&rv, threads[n]); | |
| } | |
| } |
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