कोड:std :: धागा निर्माण फेंकता अपवाद
#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;
}
}
बिल्ड:
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
परिणाम:
बनाने धागा
कार्रवाई की अनुमति नहीं
यह कैसे तय किया जा सकता है?
संपादित करें:
strace के साथ कार्यक्रम चल रहा है:
[email protected]:~/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) = ?
जीसीसी का कौन सा संस्करण? – mark
जी ++ (उबंटू/लिनारो 4.6.1-9ubuntu3) 4.6.1 –
"स्ट्रेस" करें और देखें कि कौन सी सिस्टम कॉल आपको "अनुमति नहीं है" के साथ अस्वीकार करती है। यह आपके कोड के साथ बहुत कम है, अनुमतियों के साथ, प्रक्रिया विशेषताओं, आदि (जैसे ulimit) –