$ cat /etc/*-release LSB_VERSION="1.3" Red Hat Enterprise Linux AS release 3 (Taroon) [jmudd@ares jmudd]$ lsb_release -a LSB Version: 1.3 Distributor ID: RedHatEnterpriseAS Description: Red Hat Enterprise Linux AS release 3 (Taroon) Release: 3 Codename: Taroon $ uname -mrs Linux 2.4.21-4.EL i686 $ cat /proc/version Linux version 2.4.21-4.EL (bhcompile@daffy.perf.redhat.com) (gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-20)) #1 Fri Oct 3 18:13:58 EDT 2003 $ logfile: 25920 execve("/home/jmudd/test_threads2", ["test_threads2"], [/* 26 vars */]) = 0 25920 rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0 25920 set_thread_area({entry_number:-1 -> 6, base_addr:0x804e540, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0 25920 set_tid_address(0x804e558) = 25920 25920 mmap2(NULL, 90112, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb75ea000 25920 mprotect(0xb75eb000, 86016, PROT_READ|PROT_WRITE) = 0 25920 clone(child_stack=0xb75fff30, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|CLONE_DETACHED, parent_tidptr=0xb75fff58, {entry_number:6, base_addr:0xb75fff40, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}, child_tidptr=0xb75fff58) = 25921 25920 mmap2(NULL, 90112, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb75d4000 25920 mprotect(0xb75d5000, 86016, PROT_READ|PROT_WRITE) = 0 25920 clone(child_stack=0xb75e9f30, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|CLONE_DETACHED, parent_tidptr=0xb75e9f58, {entry_number:6, base_addr:0xb75e9f40, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}, child_tidptr=0xb75e9f58) = 25922 25920 futex(0xb75fff58, FUTEX_WAIT, 25921, NULL 25922 --- SIGSTOP (Stopped (signal)) @ 0 (0) --- 25922 --- SIGSTOP (Stopped (signal)) @ 0 (0) --- 25920 <... futex resumed> ) = -1 EINTR (Interrupted system call) 25922 --- SIGSTOP (Stopped (signal)) @ 0 (0) --- 25920 --- SIGSTOP (Stopped (signal)) @ 0 (0) --- 25920 futex(0xb75fff58, FUTEX_WAIT, 25921, NULL 25921 --- SIGSTOP (Stopped (signal)) @ 0 (0) --- 25921 --- SIGSTOP (Stopped (signal)) @ 0 (0) --- 25920 <... futex resumed> ) = -1 EINTR (Interrupted system call) 25921 --- SIGSTOP (Stopped (signal)) @ 0 (0) --- 25920 --- SIGSTOP (Stopped (signal)) @ 0 (0) --- 25921 futex(0x804e0c4, FUTEX_WAIT, -2147483632, NULL 25920 futex(0xb75fff58, FUTEX_WAIT, 25921, NULL 25922 futex(0x804e0c4, FUTEX_WAKE, 1) = 1 25921 <... futex resumed> ) = 0 25921 futex(0x804e0e8, FUTEX_WAIT, 0, NULL 25922 futex(0x804e0e8, FUTEX_WAKE, 1) = 1 25921 <... futex resumed> ) = 0 25921 futex(0x804e0c4, FUTEX_WAIT, -2147483632, NULL 25922 futex(0x804e0c4, FUTEX_WAKE, 1) = 1 25921 <... futex resumed> ) = 0 25921 ioctl(1, TCGETS, {B38400 opost isig icanon echo ...}) = 0 25921 writev(1, [{"Counter value functionCount1: 1", 31}, {"\n", 1}], 2) = 32 25921 futex(0x804e0e8, FUTEX_WAIT, 1, NULL 25922 futex(0x804e0e8, FUTEX_WAKE, 1) = 1 25921 <... futex resumed> ) = 0 25921 futex(0x804e0c4, FUTEX_WAIT, -2147483632, NULL 25922 futex(0x804e0c4, FUTEX_WAKE, 1) = 1 25921 <... futex resumed> ) = 0 25921 writev(1, [{"Counter value functionCount1: 2", 31}, {"\n", 1}], 2) = 32 25921 futex(0x804e0e8, FUTEX_WAIT, 2, NULL 25922 futex(0x804e0e8, FUTEX_WAKE, 1) = 1 25921 <... futex resumed> ) = 0 25921 futex(0x804e0c4, FUTEX_WAIT, -2147483632, NULL 25922 futex(0x804e0c4, FUTEX_WAKE, 1) = 1 25921 <... futex resumed> ) = 0 25921 writev(1, [{"Counter value functionCount1: 3", 31}, {"\n", 1}], 2) = 32 25921 futex(0x804e0e8, FUTEX_WAIT, 3, NULL 25922 writev(1, [{"Counter value functionCount2: 4", 31}, {"\n", 1}], 2) = 32 25922 writev(1, [{"Counter value functionCount2: 5", 31}, {"\n", 1}], 2) = 32 25922 writev(1, [{"Counter value functionCount2: 6", 31}, {"\n", 1}], 2) = 32 25922 writev(1, [{"Counter value functionCount2: 7", 31}, {"\n", 1}], 2) = 32 25922 futex(0x804e0e8, FUTEX_WAKE, 1) = 1 25921 <... futex resumed> ) = 0 25921 futex(0x804e0c4, FUTEX_WAIT, -2147483632, NULL 25922 futex(0x804e0c4, FUTEX_WAKE, 1) = 1 25921 <... futex resumed> ) = 0 25921 writev(1, [{"Counter value functionCount1: 8", 31}, {"\n", 1}], 2) = 32 25921 futex(0x804e0e8, FUTEX_WAIT, 4, NULL 25922 futex(0x804e0e8, FUTEX_WAKE, 1) = 1 25921 <... futex resumed> ) = 0 25921 futex(0x804e0c4, FUTEX_WAIT, -2147483632, NULL 25922 futex(0x804e0c4, FUTEX_WAKE, 1) = 1 25921 <... futex resumed> ) = 0 25921 writev(1, [{"Counter value functionCount1: 9", 31}, {"\n", 1}], 2) = 32 25921 futex(0x804e0e8, FUTEX_WAIT, 5, NULL 25922 futex(0x804e0e8, FUTEX_WAKE, 1) = 1 25921 <... futex resumed> ) = 0 25921 futex(0x804e0c4, FUTEX_WAIT, -2147483632, NULL 25922 futex(0x804e0c4, FUTEX_WAKE, 1) = 1 25921 <... futex resumed> ) = 0 25921 writev(1, [{"Counter value functionCount1: 10", 32}, {"\n", 1}], 2) = 33 25921 rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 25921 _exit(0) = ? 25920 <... futex resumed> ) = 0 25920 munmap(0xb75ea000, 90112) = 0 25920 futex(0xb75e9f58, FUTEX_WAIT, 25922, NULL 25922 rt_sigprocmask(SIG_BLOCK, ~[], [], 8) = 0 25922 _exit(0) = ? 25920 <... futex resumed> ) = 0 25920 munmap(0xb75d4000, 90112) = 0 25920 writev(1, [{"Final count: 10", 15}, {"\n", 1}], 2) = 16 25920 exit_group(0) = ? On Fri, Mar 21, 2014 at 2:02 PM, Rich Felker wrote: > On Fri, Mar 21, 2014 at 01:54:34PM -0400, John Mudd wrote: > > Here is the regular and strace output on 2.4 kernel, more specifically > > Linux 2.4.21-4.EL #1 Fri Oct 3 18:13:58 EDT 2003 i686 i686 i386 > GNU/Linux. > > > > $ test_threads2 > > Counter value functionCount1: 1 > > Counter value functionCount1: 2 > > Counter value functionCount1: 3 > > Counter value functionCount2: 4 > > Counter value functionCount2: 5 > > Counter value functionCount2: 6 > > Counter value functionCount2: 7 > > Counter value functionCount1: 8 > > Counter value functionCount1: 9 > > Counter value functionCount1: 10 > > Final count: 10 > > $ > > > > $ strace test_threads2 > > execve("/home/jmudd/test_threads2", ["test_threads2"], [/* 26 vars */]) > = 0 > > rt_sigprocmask(SIG_UNBLOCK, [RT_1 RT_2], NULL, 8) = 0 > > set_thread_area({entry_number:-1 -> 6, base_addr:0x804e540, > limit:1048575, > > seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, > > seg_not_present:0, useable:1}) = 0 > > set_tid_address(0x804e558) = 25884 > > mmap2(NULL, 90112, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = > 0xb75ea000 > > mprotect(0xb75eb000, 86016, PROT_READ|PROT_WRITE) = 0 > > clone(child_stack=0xb75fff30, > > > flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|CLONE_DETACHED, > > parent_tidptr=0xb75fff58, {entry_number:6, base_addr:0xb75fff40, > > limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, > limit_in_pages:1, > > seg_not_present:0, useable:1}, child_tidptr=0xb75fff58) = 25885 > > mmap2(NULL, 90112, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = > 0xb75d4000 > > mprotect(0xb75d5000, 86016, PROT_READ|PROT_WRITE) = 0 > > clone(child_stack=0xb75e9f30, > > > flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID|CLONE_DETACHED, > > parent_tidptr=0xb75e9f58, {entry_number:6, base_addr:0xb75e9f40, > > limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, > limit_in_pages:1, > > seg_not_present:0, useable:1}, child_tidptr=0xb75e9f58) = 25886 > > futex(0xb75fff58, FUTEX_WAIT, 25885, NULLCounter value functionCount1: 1 > > Counter value functionCount1: 2 > > Counter value functionCount1: 3 > > Counter value functionCount2: 4 > > Counter value functionCount2: 5 > > Counter value functionCount2: 6 > > Counter value functionCount2: 7 > > Counter value functionCount1: 8 > > Counter value functionCount1: 9 > > Counter value functionCount1: 10 > > ) = 0 > > munmap(0xb75ea000, 90112) = 0 > > munmap(0xb75d4000, 90112) = 0 > > writev(1, [{"Final count: 10", 15}, {"\n", 1}], 2Final count: 10 > > ) = 16 > > exit_group(0) = ? > > $ > > Is this a stock 2.4.x kernel or a distro-modified one that might have > things backported from 2.6? > > Can you re-run the strace with: > > strace -f -o logfile test_threads2 > > -f is needed to trace anything but the main thread/original process, > and -o to a file produces nicer output (pid/tid on each line) than the > usual default. > > Rich >