Question

我有一个C ++共享库对象，它包含GLib library。

当我使用空main() 函数创建一个最小测试程序，并且我与共享库链接时，程序会在运行时立即中止，并显示以下GLib错误消息：

GLib (gthread-posix.c): Unexpected error from C library during 'pthread_cond_init': Invalid argument.  Aborting.

由于我的main函数为空，因此必须在某些预主要初始化函数中发生错误。因此，使用GDB我发现GLib有一个静态初始化构造函数（在glib-init.c中），它在main()之前在运行时调用。在该初始化函数中，它调用pthread_cond_init，这会神秘地失败。

以下是完整的回溯：

(gdb) run
Starting program: ~/example
warning: no loadable sections found in added symbol-file system-supplied DSO at 0x2aaaaaaab000
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
GLib (gthread-posix.c): Unexpected error from C library during 'pthread_cond_init': Invalid argument.  Aborting.

Program received signal SIGABRT, Aborted.
0x0000003891830265 in raise () from /lib64/libc.so.6
(gdb) bt
#0  0x0000003891830265 in raise () from /lib64/libc.so.6
#1  0x0000003891831d10 in abort () from /lib64/libc.so.6
#2  0x00002aaaab9aed32 in g_thread_abort (status=22,
    function=0x2aaaabcbdd2b "pthread_cond_init")
    at ~/libs/glib/gthread-posix.c:75
#3  0x00002aaaab9af349 in g_cond_impl_new ()
    at ~/libs/glib/gthread-posix.c:656
#4  0x00002aaaab9af39b in g_cond_get_impl (
    cond=0x2aaaac15f690 <g_once_cond>)
    at ~/libs/glib/gthread-posix.c:677
#5  0x00002aaaab9af4b2 in g_cond_broadcast (
    cond=0x2aaaac15f690 <g_once_cond>)
    at ~/libs/glib/gthread-posix.c:792
#6  0x00002aaaab9ab529 in g_once_init_leave (
    location=0x2aaaac160510 <g_define_type_id__volatile.11714>,
    result=6524000) at ~/libs/glib/gthread.c:682
#7  0x00002aaaaba34a2f in g_value_array_get_type ()
    at ~/libs/gobject/gboxed.c:132
#8  0x00002aaaaba41b28 in _g_param_spec_types_init ()
    at ~/libs/gobject/gparamspecs.c:1511
#9  0x00002aaaaba30c72 in gobject_init_ctor ()
    at ~/libs/gobject/gtype.c:4391
#10 0x00002aaaabb2bc36 in __do_global_ctors_aux ()
   from ./MYLIB.so
#11 0x00002aaaaad368eb in _init () from ./MYLIB.so
#12 0x00002aaab0180e60 in ?? ()
#13 0x000000389140d4ab in call_init ()
  from /lib64/ld-linux-x86-64.so.2
#14 0x000000389140d5b5 in _dl_init_internal ()
   from /lib64/ld-linux-x86-64.so.2
#15 0x0000003891400aaa in _dl_start_user ()
   from /lib64/ld-linux-x86-64.so.2
#16 0x0000000000000001 in ?? ()
#17 0x00007fffffffe6de in ?? ()
#18 0x0000000000000000 in ?? ()

所以，我的第一个想法可能是.so文件没有与pthread库正确链接。所以，我使用ldd实用程序来检查它如何链接到pthread：

$ ldd MYLIB.so
        linux-vdso.so.1 =>  (0x00007fff56ed1000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00002b8a747bf000)
        librt.so.1 => /lib64/librt.so.1 (0x00002b8a749db000)
        libpng12.so.0 => /usr/lib64/libpng12.so.0 (0x00002b8a74be5000)
        libfontconfig.so.1 => /usr/lib64/libfontconfig.so.1 (0x00002b8a74e09000)
        libz.so.1 => /lib64/libz.so.1 (0x00002b8a7503d000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00002b8a75252000)
        libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x00002b8a75456000)
        libm.so.6 => /lib64/libm.so.6 (0x00002b8a75756000)
        libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00002b8a759da000)
        libc.so.6 => /lib64/libc.so.6 (0x00002b8a75be8000)
        /lib64/ld-linux-x86-64.so.2 (0x0000003891400000)
        libfreetype.so.6 => /usr/lib64/libfreetype.so.6 (0x00002b8a75f41000)
        libexpat.so.0 => /lib64/libexpat.so.0 (0x00002b8a761c6000)

因此，它通过/usr/lib64/pthread.so.0

与libpthread正确链接

然后我查看了pthread_cond_init失败的GLib源代码。这非常简单。为清晰起见，我删除了一些#ifdef语句：

  pthread_condattr_t attr;
  pthread_cond_t *cond;
  gint status;
  pthread_condattr_init (&attr);

  cond = malloc (sizeof (pthread_cond_t));
  if G_UNLIKELY (cond == NULL)
    g_thread_abort (errno, "malloc");

  if G_UNLIKELY ((status = pthread_cond_init (cond, &attr)) != 0) <--- this fails
    g_thread_abort (status, "pthread_cond_init");

所以没有什么是错的，我怀疑GLib会有这样的明显错误，因为它被广泛用于许多主要的Linux代码库。

所以，在这一点上，我没有想法。这个问题有哪些可能和/或可能的原因？这可能是一个初始化顺序问题，其中pthread lib需要在GLib可以使用它之前执行一些静态初始化吗？

Answer 1

在import socket, sys from struct import * #create an INET, STREAMing socket try: s = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_TCP) except socket.error , msg: print 'Socket could not be created. Error Code : ' + str(msg[0]) + ' Message ' + msg[1] sys.exit() # receive a packet while True: packet = s.recvfrom(65565) #packet string from tuple packet = packet[0] #take first 20 characters for the ip header ip_header = packet[0:20] #now unpack them :) iph = unpack('!BBHHHBBH4s4s' , ip_header) version_ihl = iph[0] version = version_ihl >> 4 ihl = version_ihl & 0xF iph_length = ihl * 4 ttl = iph[5] protocol = iph[6] s_addr = socket.inet_ntoa(iph[8]); d_addr = socket.inet_ntoa(iph[9]); print 'Version : ' + str(version) + ' IP Header Length : ' + str(ihl) + ' TTL : ' + str(ttl) + ' Protocol : ' + str(protocol) + ' Source Address : ' + str(s_addr) + ' Destination Address : ' + str(d_addr) tcp_header = packet[iph_length:iph_length+20] #now unpack them :) tcph = unpack('!HHLLBBHHH' , tcp_header) source_port = tcph[0] dest_port = tcph[1] sequence = tcph[2] acknowledgement = tcph[3] doff_reserved = tcph[4] tcph_length = doff_reserved >> 4 print 'Source Port : ' + str(source_port) + ' Dest Port : ' + str(dest_port) + ' Sequence Number : ' + str(sequence) + ' Acknowledgement : ' + str(acknowledgement) + ' TCP header length : ' + str(tcph_length) h_size = iph_length + tcph_length * 4 data_size = len(packet) - h_size #get data from the packet data = packet[h_size:] print 'Data : ' + data print中，glibc-2.5有两个版本。可能使用的旧版本有一个评论

除了CLOCK_REALTIME
之外，都不是时钟

受支持，可以返回pthread_cond_init。

在EINVAL的{{3}}行中，有一个电话

gthread-posix.c

可能导致pthread_condattr_setclock (&attr, CLOCK_MONOTONIC);从EINVAL返回。

如果您可以重新编译pthread_cond_init，则可以取消定义glib。

否则我会尽可能更新HAVE_PTHREAD_CONDATTR_SETCLOCK。

从静态构造函数代码

1 个答案: