$ getconf GNU_LIBPTHREAD_VERSION NPTL 0.60 $ So that's it, I lucked out? I can start building my apps on a modern Linux and still run on my older ones? If so then this is like being told time travel is possible. On Fri, Mar 21, 2014 at 2:24 PM, John Mudd wrote: > $ 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 >> > >