Std :: thread creation throws an exception

Question

the code:

#include <iostream> #include <thread> void hello() { std::cout << "Hello World" << std::endl; } int main() { try { std::cout << "creating thread" << std::endl; std::thread t(hello); std::cout << "waiting" << std::endl; t.join(); std::cout << "done" << std::endl; } catch(std::exception& ex) { std::cout << ex.what() << std::endl; } } 

Addition:

 g++ -Wall -fexceptions -std=c++0x -pthread -g -c /home/alex/tmp/thread_test/main.cpp -o obj/Debug/main.o g++ -o bin/Debug/thread_test obj/Debug/main.o Output size is 106.62 KB Process terminated with status 0 (0 minutes, 0 seconds) 0 errors, 0 warnings 

Result:

stream creation
Operation not allowed

How can this be fixed?

Edit:
Running the program using strace:

 alex@alex-64 :~/tmp/thread_test/bin/Debug$ strace ./thread_test execve("./thread_test", ["./thread_test"], [/* 38 vars */]) = 0 brk(0) = 0x189a000 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7c60cbc000 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache", O_RDONLY) = 3 fstat(3, {st_mode=S_IFREG|0644, st_size=121299, ...}) = 0 mmap(NULL, 121299, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f7c60c9e000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/usr/lib/x86_64-linux-gnu/libstdc++.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\244\5\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=991424, ...}) = 0 mmap(NULL, 3171440, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f7c60797000 mprotect(0x7f7c6087f000, 2097152, PROT_NONE) = 0 mmap(0x7f7c60a7f000, 40960, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xe8000) = 0x7f7c60a7f000 mmap(0x7f7c60a89000, 83056, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f7c60a89000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/x86_64-linux-gnu/libgcc_s.so.1", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\260(\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=88384, ...}) = 0 mmap(NULL, 2184216, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f7c60581000 mprotect(0x7f7c60596000, 2093056, PROT_NONE) = 0 mmap(0x7f7c60795000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14000) = 0x7f7c60795000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 \24\2\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0755, st_size=1685816, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7c60c9d000 mmap(NULL, 3801960, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f7c601e0000 mprotect(0x7f7c60377000, 2093056, PROT_NONE) = 0 mmap(0x7f7c60576000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x196000) = 0x7f7c60576000 mmap(0x7f7c6057b000, 21352, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f7c6057b000 close(3) = 0 access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory) open("/lib/x86_64-linux-gnu/libm.so.6", O_RDONLY) = 3 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360>\0\0\0\0\0\0"..., 832) = 832 fstat(3, {st_mode=S_IFREG|0644, st_size=538928, ...}) = 0 mmap(NULL, 2633960, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f7c5ff5c000 mprotect(0x7f7c5ffdf000, 2093056, PROT_NONE) = 0 mmap(0x7f7c601de000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x82000) = 0x7f7c601de000 close(3) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7c60c9c000 mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7c60c9a000 arch_prctl(ARCH_SET_FS, 0x7f7c60c9a740) = 0 mprotect(0x7f7c601de000, 4096, PROT_READ) = 0 mprotect(0x7f7c60576000, 16384, PROT_READ) = 0 mprotect(0x7f7c60795000, 4096, PROT_READ) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7c60c99000 mprotect(0x7f7c60a7f000, 32768, PROT_READ) = 0 mprotect(0x603000, 4096, PROT_READ) = 0 mprotect(0x7f7c60cbe000, 4096, PROT_READ) = 0 munmap(0x7f7c60c9e000, 121299) = 0 fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 2), ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f7c60cbb000 write(1, "creating thread\n", 16creating thread ) = 16 brk(0) = 0x189a000 brk(0x18bb000) = 0x18bb000 write(1, "Operation not permitted\n", 24Operation not permitted ) = 24 exit_group(0) = ? 

Answer 1

Your problem is that you forgot to specify the -lpthread or -pthread for the compiler. Therefore, when creating your program, a single-threaded mode is assumed.

An exception is thrown by the C ++ standard library:

 (gdb) catch throw Function "__cxa_throw" not defined. Catchpoint 1 (throw) (gdb) run Starting program: /tmp/test creating thread Catchpoint 1 (exception thrown), 0x00007ffff7b8eff0 in __cxa_throw () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (gdb) where #0 0x00007ffff7b8eff0 in __cxa_throw () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6 #1 0x00007ffff7b3ba3e in std::__throw_system_error(int) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6 #2 0x00007ffff7b45cb7 in std::thread::_M_start_thread(std::shared_ptr<std::thread::_Impl_base>) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6 #3 0x00000000004012d4 in std::thread::thread<void (&)()>(void (&&&)()) () #4 0x0000000000400f0e in main () (gdb) quit 

I have no desire to check the source code for this, but most likely they use a "lazy" dynamic layout to determine if the POSIX feature family is available. And throw exceptions otherwise. Thus, you will get this exception if you do not contact the pthread library.

This has nothing to do with virtual memory or other resource limitations, as I thought it could happen because system calls do not report any errors. So simple:

 g++ -std=c++0x -o test ./test.cpp -pthread 

... and it will work.

UPDATE:

As @ildjaRN noted, you already specified -pthread. I suggest you specify it after your object files (source files for one call and compilation), otherwise it may not receive.

Here's how to make sure it's up - you can run ldd and make sure pthread.so does it in:

 $ g++ -std=c++0x -lpthread -o test ./test.cpp $ ldd ./test | grep pthread $ g++ -std=c++0x -o test ./test.cpp -lpthread $ ldd ./test | grep pthread libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007ff2a9073000) $ 

Hope this helps. Good luck