1ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* 2ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown This test makes sure the thread exit notification signals don't 3ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown interfere with the stack growth signals. 4ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 5ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Thread death notifications are sent as RT signals, which are 6ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown queued. In general, these notifications are ignored, since they're 7ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown only used by the main thread if it has exited and is still waiting 8ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown for the rest to exit. 9ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 10ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown The system has a finite limit to the number of RT signals which can 11ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown be queued (typically 1024), and beyond that it stops queueing 12ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown siginfo. We rely on getting SIGSEGVs with siginfo information to 13ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown grow the stack. If we don't get the siginfo, then it just looks 14ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown like the program crashed. 15ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 16ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown The extra complication in this test is making sure that the 17ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown unwanted signals are discarded while the main thread is blocked in 18ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown a syscall. So, to check this, main creates a new process, which 19ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown attempts to grow the stack once all the threads have been created 20ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown and exited. main() itself is blocked waiting for the child 21ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown process. 22ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 23ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown Oh, and this test also makes sure that thread resources are cleaned 24ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown up properly. 25ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown */ 26ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <pthread.h> 27ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <stdio.h> 28ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <string.h> 29ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <stdlib.h> 30ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <unistd.h> 31ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <signal.h> 32ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <sys/wait.h> 33ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 34ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic int grower; 35ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 36ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic void handler(int sig) 37ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 38ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 39ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 40ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic void *thr(void *v) 41ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 42ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return 0; 43ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 44ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 45ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#define FRAME 4096 46ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 47ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic void grow(int depth) 48ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 49ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown volatile char frame[FRAME]; 50ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 51ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown memset((char *)frame, 0xff, sizeof(frame)); 52ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 53ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (depth > 1) 54ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown grow(depth-1); 55ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 56ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 57ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic void *maker(void *v) 58ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 59ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown int i; 60ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 61ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown sleep(1); 62ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 63ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* Create lots of threads */ 64ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown printf("creating threads...\n"); 65ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown for(i = 0; i < 1300; i++) { 66ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown pthread_t t; 67ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown int ret; 68ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 69ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (i % 100 == 0) 70ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown printf("%d...\n", i); 71ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 72ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ret = pthread_create(&t, NULL, thr, NULL); 73ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (ret) { 74ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown printf("pthread_create failed: %s\n", strerror(ret)); 75ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown exit(1); 76ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 77ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 78ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown ret = pthread_join(t, NULL); 79ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (ret) { 80ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown printf("pthread_join failed: %s\n", strerror(ret)); 81ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown exit(1); 82ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 83ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 84ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 85ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown kill(grower, SIGUSR1); 86ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 87ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return NULL; 88ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 89ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 90ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownint main() 91ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 92ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown pthread_t pth; 93ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown sigset_t mask; 94ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown int status; 95ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown struct sigaction sa; 96ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 97ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown sigemptyset(&mask); 98ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown sigaddset(&mask, SIGCHLD); 99ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown sigprocmask(SIG_BLOCK, &mask, NULL); 100ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 101ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown sa.sa_handler = handler; 102ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown sa.sa_flags = 0; 103ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown sigfillset(&sa.sa_mask); 104ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown sigaction(SIGUSR1, &sa, NULL); 105ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 106ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown grower = fork(); 107ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 108ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (grower == -1) { 109ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown perror("fork"); 110ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown exit(1); 111ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 112ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 113ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (grower == 0) { 114ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown pause(); /* child - wait for SIGUSR1 */ 115ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown grow(10); 116ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown printf("stack grew OK\n"); 117ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown exit(0); 118ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 119ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 120ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown pthread_create(&pth, NULL, maker, NULL); 121ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 122ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* wait for child */ 123ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown if (waitpid(grower, &status, 0) != grower) 124ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown printf("FAILED\n"); 125ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown else if (WIFEXITED(status) && WEXITSTATUS(status) == 0) 126ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown printf("PASS: child OK\n"); 127ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown else 128ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown printf("FAILED: exit status=%d\n", status); 129ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 130ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown pthread_join(pth, NULL); 131ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 132ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return 0; 133ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 134