100% CPU usage if a device goes offline/disconnects

This is bfgminer compiled from source, at commit 9f781b872db9a91f741bb8d08d1e60383a84a0b2, running on Debian 9.1, controlling several gridseed "orbs" and blades. CPU and GPU mining are not enabled (at least not intentionally).

If one of my devices disappears, for example if its USB cable gets unplugged (or stepped on by my cat :stuck_out_tongue_closed_eyes: ), the kernel recognizes the disconnect event and reports it via dmesg, but this causes bfgminer to immediately start spinning at least one CPU core at 100%.

If I were to then simply shut off the USB hub, or unplug its main USB cable from the computer, that of course would cause several devices to disappear all at once. bfgminer seems to hog one CPU core per device that goes away, so it'll spin all six of my cores at 100% on such an event.

bfgminer does indicate that the disconnected devices are failing to return work, but it does not mark them as "sick" or "dead" or otherwise gracefully disconnect from them.

Since bfgminer is trying to keep its in-use device names "open", reconnecting a missing device causes the kernel/udev/whatever to give it a new name. bfgminer won't be looking for that new name (it'll usually be out of range as implied by the script below), so it doesn't react to the reconnect event.

bfgminer will continue to eat CPU indefinitely, until I exit. I can simply press 'q' or Ctrl-C when it gets into this state, so it's not hard-locked. My keepalive script restarts bfgminer after a couple of seconds, though I usually have to kill the script, reset my devices, and restart it to get them all numbered right so bfgminer will see them.

#!/bin/bash

cd /home/vanessa/coin-mining-stuff/bfgminer-official

while true; do
    timed-process 86400 \
        ./bfgminer \
            --debuglog \
            --scan-time 5 \
            -S gridseed@/dev/gridseed0 \
            -S gridseed@/dev/gridseed1 \
            -S gridseed@/dev/gridseed2 \
            -S gridseed@/dev/gridseed3 \
            -S gridseed@/dev/gridseed4 \
            -S gridseed@/dev/gridseed5 \
            -S gridseed@/dev/gridseed6 \
            -S gridseed@/dev/gridseed7 \
            -S gridseed@/dev/gridseed8 \
            -S gridseed@/dev/gridseed9 \
            -S gridseed@/dev/gridseed10 \
            -S gridseed@/dev/gridseed11 \
            -S gridseed@/dev/gridseed12 \
            --scrypt --failover-only \
            --set gridseed@6D8038644857:clock=875,chips=5 \
            --set gridseed@6D9634674857:clock=875,chips=5 \
            --set gridseed@6D9526874853:clock=900,chips=5 \
            --set gridseed@6D8F489B5748:clock=863,chips=5 \
            --set gridseed@6D7320865251:clock=863,chips=5 \
            --set gridseed@6D7835994857:clock=863,chips=5 \
            --set gridseed@48F66F773137:clock=800,chips=40 \
            --set gridseed@490153513135:clock=825,chips=40 \
            --set gridseed@48EB82553734:clock=825,chips=40 \
            --set gridseed@48F086473037:clock=825,chips=40 \
            --set gridseed@48E4556C3030:clock=825,chips=40 \
            --set gridseed@48FD746F3137:clock=825,chips=40 \
            <username and password arguments omitted>
    wait
    echo -e "\n\nKeepalive script detected exit, restarting...\n\n"
    sleep 2
done

I only explicitly enabled scrypt and gridseed drivers at compile time, but of course a bunch of other stuff got compiled in by default, so here is config.h:

/* config.h.  Generated from config.h.in by configure.  */
/* config.h.in.  Generated from configure.ac by autoheader.  */

/* List of drivers being built */
#define BFG_ALGOLIST " SHA256d scrypt "

/* List of drivers being built */
#define BFG_DRIVERLIST " antminer avalon avalonmm bfx bifury bigpic bitforce bitforce:pci bitfury cairnsmore cointerra compac drillbit dualminer erupter gridseed hashbusterusb hashfast icarus klondike littlefury modminer proxy proxy:getwork proxy:stratum rockminer twinfury x6500 zeusminer ztex "

/* List of drivers being built */
#define BFG_LOWLLIST " ftdi pci pci:uio pci:vfio spi usb vcom "

/* List of drivers being built */
#define BFG_OPTLIST " ncurses5 "

/* Define to the number of bits in type 'ptrdiff_t'. */
/* #undef BITSIZEOF_PTRDIFF_T */

/* Define to the number of bits in type 'sig_atomic_t'. */
/* #undef BITSIZEOF_SIG_ATOMIC_T */

/* Define to the number of bits in type 'size_t'. */
/* #undef BITSIZEOF_SIZE_T */

/* Define to the number of bits in type 'wchar_t'. */
/* #undef BITSIZEOF_WCHAR_T */

/* Define to the number of bits in type 'wint_t'. */
/* #undef BITSIZEOF_WINT_T */

/* Major version */
#define CGMINER_MAJOR_VERSION 5

/* Micro version */
#define CGMINER_MINOR_SUBVERSION 2

/* Minor version */
#define CGMINER_MINOR_VERSION 4

/* */
/* #undef CONTROLLER_BOARD_BACKPLANE */

/* */
/* #undef CONTROLLER_BOARD_BBB */

/* */
/* #undef CONTROLLER_BOARD_RPI */

/* Define to one of `_getb67', `GETB67', `getb67' for Cray-2 and Cray-YMP
   systems. This function is required for `alloca.c' support on those systems.
   */
/* #undef CRAY_STACKSEG_END */

/* Define to 1 if using `alloca.c'. */
/* #undef C_ALLOCA */

/* Maximum sockets before fd_set overflows */
/* #undef FD_SETSIZE */

/* Syntax of format-checking attribute */
#define FORMAT_SYNTAX_CHECK(...) __attribute__(( format(__VA_ARGS__) ))

/* Define to 1 when the gnulib module memchr should be tested. */
#define GNULIB_TEST_MEMCHR 1

/* Define to 1 when the gnulib module memmem should be tested. */
#define GNULIB_TEST_MEMMEM 1

/* Define to 1 when the gnulib module sigaction should be tested. */
#define GNULIB_TEST_SIGACTION 1

/* Define to 1 when the gnulib module sigprocmask should be tested. */
#define GNULIB_TEST_SIGPROCMASK 1

/* Define to 1 when the gnulib module strtok_r should be tested. */
#define GNULIB_TEST_STRTOK_R 1

/* Defined if ADL headers were found */
/* #undef HAVE_ADL */

/* Define to 1 if you have `alloca', as a function or macro. */
#define HAVE_ALLOCA 1

/* Define to 1 if you have <alloca.h> and it should be used (not on Ultrix).
   */
#define HAVE_ALLOCA_H 1

/* Define if __attribute__((cold)) */
#define HAVE_ATTRIBUTE_COLD 1

/* Define if __attribute__((const)) */
#define HAVE_ATTRIBUTE_CONST 1

/* Define if __attribute__((noreturn)) */
#define HAVE_ATTRIBUTE_NORETURN 1

/* Define if __attribute__((format(__printf__))) */
#define HAVE_ATTRIBUTE_PRINTF 1

/* Define if __attribute__((unused)) */
#define HAVE_ATTRIBUTE_UNUSED 1

/* Define if __attribute__((used)) */
#define HAVE_ATTRIBUTE_USED 1

/* Defined to 1 if lowlevel drivers are being used */
#define HAVE_BFG_LOWLEVEL 1

/* Define to 1 if you have the <bp-sym.h> header file. */
/* #undef HAVE_BP_SYM_H */

/* Define if have __builtin_constant_p */
#define HAVE_BUILTIN_CONSTANT_P 1

/* Define if have __builtin_types_compatible_p */
#define HAVE_BUILTIN_TYPES_COMPATIBLE_P 1

/* Define to use byteswap macros from byteswap.h */
#define HAVE_BYTESWAP_H 1

/* Define to 1 if you have the `chroot' function. */
#define HAVE_CHROOT 1

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#define HAVE_CLOCK_GETTIME_MONOTONIC 1

/* Defined to 1 if clock_gettime(CLOCK_MONOTONIC_RAW) is defined */
#define HAVE_CLOCK_GETTIME_MONOTONIC_RAW 1

/* Define to 1 if you have the `clock_nanosleep' function. */
#define HAVE_CLOCK_NANOSLEEP 1

/* Defined to 1 if curses TUI support is wanted */
#define HAVE_CURSES 1

/* Define to 1 if you have the declaration of `libusb_error_name', and to 0 if
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#define HAVE_DECL_LIBUSB_ERROR_NAME 1

/* Define to 1 if you have the declaration of `memmem', and to 0 if you don't.
   */
#define HAVE_DECL_MEMMEM 1

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/* Define if you have libusb-1.0 */
#define HAVE_LIBUSB 1

/* Define to 1 if you have the <linux/i2c-dev-user.h> header file. */
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/* Define to 1 if you have the <linux/spi/spidev.h> header file. */
#define HAVE_LINUX_SPI_SPIDEV_H 1

/* Define to 1 if you have the `log2' function. */
#define HAVE_LOG2 1

/* Define to 1 if the system has the type `long long int'. */
#define HAVE_LONG_LONG_INT 1

/* Define to 1 if mmap()'s MAP_ANONYMOUS flag is available after including
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#define HAVE_MAP_ANONYMOUS 1

/* Define to 1 if you have the `memmem' function. */
#define HAVE_MEMMEM 1

/* Define to 1 if you have the <memory.h> header file. */
#define HAVE_MEMORY_H 1

/* Define to 1 if you have the `mprotect' function. */
#define HAVE_MPROTECT 1

/* Define to 1 if you have the `nanosleep' function. */
#define HAVE_NANOSLEEP 1

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#define HAVE_PTHREAD_CANCEL 1

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/* Define to 1 if rawmemchr is declared even after undefining macros. */
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#define HAVE_RAW_DECL_SIGADDSET 1

/* Define to 1 if sigdelset is declared even after undefining macros. */
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/* Define to 1 if sigemptyset is declared even after undefining macros. */
#define HAVE_RAW_DECL_SIGEMPTYSET 1

/* Define to 1 if sigfillset is declared even after undefining macros. */
#define HAVE_RAW_DECL_SIGFILLSET 1

/* Define to 1 if sigismember is declared even after undefining macros. */
#define HAVE_RAW_DECL_SIGISMEMBER 1

/* Define to 1 if sigpending is declared even after undefining macros. */
#define HAVE_RAW_DECL_SIGPENDING 1

/* Define to 1 if sigprocmask is declared even after undefining macros. */
#define HAVE_RAW_DECL_SIGPROCMASK 1

/* Define to 1 if stpcpy is declared even after undefining macros. */
#define HAVE_RAW_DECL_STPCPY 1

/* Define to 1 if stpncpy is declared even after undefining macros. */
#define HAVE_RAW_DECL_STPNCPY 1

/* Define to 1 if strcasestr is declared even after undefining macros. */
#define HAVE_RAW_DECL_STRCASESTR 1

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/* Define to 1 if strncat is declared even after undefining macros. */
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#define HAVE_RAW_DECL_STRNDUP 1

/* Define to 1 if strnlen is declared even after undefining macros. */
#define HAVE_RAW_DECL_STRNLEN 1

/* Define to 1 if strpbrk is declared even after undefining macros. */
#define HAVE_RAW_DECL_STRPBRK 1

/* Define to 1 if strsep is declared even after undefining macros. */
#define HAVE_RAW_DECL_STRSEP 1

/* Define to 1 if strsignal is declared even after undefining macros. */
#define HAVE_RAW_DECL_STRSIGNAL 1

/* Define to 1 if strtok_r is declared even after undefining macros. */
#define HAVE_RAW_DECL_STRTOK_R 1

/* Define to 1 if strverscmp is declared even after undefining macros. */
#define HAVE_RAW_DECL_STRVERSCMP 1

/* Defined if libsensors was found */
/* #undef HAVE_SENSORS */

/* Define to 1 if you have the `setrlimit' function. */
#define HAVE_SETRLIMIT 1

/* Define to 1 if you have the `sigaction' function. */
#define HAVE_SIGACTION 1

/* Define to 1 if you have the `sigaltstack' function. */
#define HAVE_SIGALTSTACK 1

/* Define to 1 if the system has the type `siginfo_t'. */
/* #undef HAVE_SIGINFO_T */

/* Define to 1 if you have the `siginterrupt' function. */
#define HAVE_SIGINTERRUPT 1

/* Define to 1 if 'sig_atomic_t' is a signed integer type. */
/* #undef HAVE_SIGNED_SIG_ATOMIC_T */

/* Define to 1 if 'wchar_t' is a signed integer type. */
/* #undef HAVE_SIGNED_WCHAR_T */

/* Define to 1 if 'wint_t' is a signed integer type. */
/* #undef HAVE_SIGNED_WINT_T */

/* Define to 1 if the system has the type `sigset_t'. */
/* #undef HAVE_SIGSET_T */

/* Define to 1 if you have the `sleep' function. */
#define HAVE_SLEEP 1

/* Defined to 1 if yasm is being used */
/* #undef HAVE_SSE2 */

/* Define to 1 if you have the <stdint.h> header file. */
#define HAVE_STDINT_H 1

/* Define to 1 if you have the <stdlib.h> header file. */
#define HAVE_STDLIB_H 1

/* Define to 1 if you have the <strings.h> header file. */
#define HAVE_STRINGS_H 1

/* Define to 1 if you have the <string.h> header file. */
#define HAVE_STRING_H 1

/* Define to 1 if you have the `strtok_r' function. */
#define HAVE_STRTOK_R 1

/* Define to 1 if `sa_sigaction' is a member of `struct sigaction'. */
#define HAVE_STRUCT_SIGACTION_SA_SIGACTION 1

/* Define to 1 if you have the <syslog.h> header file. */
#define HAVE_SYSLOG_H 1

/* Define to 1 if you have the <sys/bitypes.h> header file. */
/* #undef HAVE_SYS_BITYPES_H */

/* Define to use byteswap macros from sys/endian.h */
/* #undef HAVE_SYS_ENDIAN_H */

/* Define to 1 if you have the <sys/epoll.h> header file. */
#define HAVE_SYS_EPOLL_H 1

/* Define to 1 if you have the <sys/file.h> header file. */
#define HAVE_SYS_FILE_H 1

/* Define to 1 if you have the <sys/inttypes.h> header file. */
/* #undef HAVE_SYS_INTTYPES_H */

/* Define to 1 if you have the <sys/mman.h> header file. */
#define HAVE_SYS_MMAN_H 1

/* Define to 1 if you have the <sys/prctl.h> header file. */
#define HAVE_SYS_PRCTL_H 1

/* Define to 1 if you have the <sys/stat.h> header file. */
#define HAVE_SYS_STAT_H 1

/* Define to 1 if you have the <sys/termios.h> header file. */
#define HAVE_SYS_TERMIOS_H 1

/* Define to 1 if you have the <sys/types.h> header file. */
#define HAVE_SYS_TYPES_H 1

/* Define to 1 if you have the <unistd.h> header file. */
#define HAVE_UNISTD_H 1

/* Define to 1 if the system has the type `unsigned long long int'. */
#define HAVE_UNSIGNED_LONG_LONG_INT 1

/* Define if __attribute__((warn_unused_result)) */
#define HAVE_WARN_UNUSED_RESULT 1

/* Define to 1 if you have the <wchar.h> header file. */
#define HAVE_WCHAR_H 1

/* Define if you have the 'wchar_t' type. */
#define HAVE_WCHAR_T 1

/* Defined to 1 if Windows DDK USB headers are being used */
/* #undef HAVE_WIN_DDKUSB */

/* Defined to 1 if yasm is being used */
/* #undef HAVE_YASM */

/* Define to a substitute value for mmap()'s MAP_ANONYMOUS flag. */
/* #undef MAP_ANONYMOUS */

/* Defined to 1 if lowlevel ftdi drivers are being used */
#define NEED_BFG_LOWL_FTDI 1

/* Defined to 1 if lowlevel hid drivers are being used */
/* #undef NEED_BFG_LOWL_HID */

/* Defined to 1 if lowlevel mswin drivers are being used */
/* #undef NEED_BFG_LOWL_MSWIN */

/* Defined to 1 if lowlevel PCI drivers are being used */
#define NEED_BFG_LOWL_PCI 1

/* Defined to 1 if lowlevel SPI drivers are being used */
#define NEED_BFG_LOWL_SPI 1

/* Defined to 1 if lowlevel VCOM drivers are being used */
#define NEED_BFG_LOWL_VCOM 1

/* Defined if linux/i2c.h is needed to supplement linux/i2c-dev.h */
#define NEED_LINUX_I2C_H 1

/* Syntax of noreturn attribute */
#define NORETURN __attribute__((noreturn))

/* Name of package */
#define PACKAGE "bfgminer"

/* Define to the address where bug reports for this package should be sent. */
#define PACKAGE_BUGREPORT "luke-jr+bfgminer@utopios.org"

/* Define to the full name of this package. */
#define PACKAGE_NAME "bfgminer"

/* Define to the full name and version of this package. */
#define PACKAGE_STRING "bfgminer 5.4.2"

/* Define to the one symbol short name of this package. */
#define PACKAGE_TARNAME "bfgminer"

/* Define to the home page for this package. */
#define PACKAGE_URL ""

/* Define to the version of this package. */
#define PACKAGE_VERSION "5.4.2"

/* Define to l, ll, u, ul, ull, etc., as suitable for constants of type
   'ptrdiff_t'. */
/* #undef PTRDIFF_T_SUFFIX */

/* Define to l, ll, u, ul, ull, etc., as suitable for constants of type
   'sig_atomic_t'. */
/* #undef SIG_ATOMIC_T_SUFFIX */

/* Define to l, ll, u, ul, ull, etc., as suitable for constants of type
   'size_t'. */
/* #undef SIZE_T_SUFFIX */

/* If using the C implementation of alloca, define if you know the
   direction of stack growth for your system; otherwise it will be
   automatically deduced at runtime.
    STACK_DIRECTION > 0 => grows toward higher addresses
    STACK_DIRECTION < 0 => grows toward lower addresses
    STACK_DIRECTION = 0 => direction of growth unknown */
/* #undef STACK_DIRECTION */

/* Define to 1 if you have the ANSI C header files. */
#define STDC_HEADERS 1

/* Defined to 1 if []_this_name support is wanted */
/* #undef USE_ALCHEMIST */

/* Defined to 1 if []_this_name support is wanted */
#define USE_AVALON 1

/* Defined to 1 if []_this_name support is wanted */
#define USE_AVALONMM 1

/* Defined to 1 if []_this_name support is wanted */
/* #undef USE_BFSB */

/* Defined to 1 if []_this_name support is wanted */
#define USE_BFX 1

/* Defined to 1 if []_this_name support is wanted */
#define USE_BIFURY 1

/* Defined to 1 if []_this_name support is wanted */
#define USE_BIGPIC 1

/* Defined to 1 if []_this_name support is wanted */
#define USE_BITFORCE 1

/* Defined to 1 if []_this_name support is wanted */
#define USE_BITFURY 1

/* Defined to 1 if []_this_name support is wanted */
/* #undef USE_BITMAIN */

/* Defined to 1 if []_this_name support is wanted */
#define USE_COINTERRA 1

/* Defined to 1 if []_this_name support is wanted */
/* #undef USE_CPUMINING */

/* Defined to 1 if []_this_name support is wanted */
#define USE_DRILLBIT 1

/* Defined to 1 if []_this_name support is wanted */
#define USE_DUALMINER 1

/* Defined to 1 if []_this_name support is wanted */
#define USE_GRIDSEED 1

/* Defined to 1 if []_this_name support is wanted */
/* #undef USE_HASHBUSTER */

/* Defined to 1 if []_this_name support is wanted */
#define USE_HASHBUSTERUSB 1

/* Defined to 1 if []_this_name support is wanted */
#define USE_HASHFAST 1

/* Defined to 1 if []_this_name support is wanted */
#define USE_ICARUS 1

/* Defined to 1 if []_this_name support is wanted */
/* #undef USE_JINGTIAN */

/* Defined to 1 if []_this_name support is wanted */
/* #undef USE_KECCAK */

/* Defined to 1 if []_this_name support is wanted */
#define USE_KLONDIKE 1

/* Defined to 1 if []_this_name support is wanted */
/* #undef USE_KNC */

/* Defined to 1 if []_this_name support is wanted */
/* #undef USE_KNCASIC */

/* Defined to 1 if libevent support is wanted */
#define USE_LIBEVENT 1

/* Defined to 1 if libmicrohttpd support is wanted */
#define USE_LIBMICROHTTPD 1

/* Defined to 1 if []_this_name support is wanted */
#define USE_LITTLEFURY 1

/* Defined to 1 if []_this_name support is wanted */
/* #undef USE_METABANK */

/* Defined to 1 if []_this_name support is wanted */
/* #undef USE_MINERGATE */

/* Defined to 1 if []_this_name support is wanted */
/* #undef USE_MINION */

/* Defined to 1 if []_this_name support is wanted */
#define USE_MODMINER 1

/* Defined to 1 if []_this_name support is wanted */
/* #undef USE_NANOFURY */

/* Defined to 1 if []_this_name support is wanted */
/* #undef USE_OPENCL */

/* Defined to 1 if OpenCL fullheader kernel interface is wanted */
/* #undef USE_OPENCL_FULLHEADER */

/* Defined to 1 if []_this_name support is wanted */
#define USE_ROCKMINER 1

/* Defined to 1 if []_this_name support is wanted */
#define USE_SCRYPT 1

/* Defined to 1 if []_this_name support is wanted */
#define USE_SHA256D 1

/* Defined to 1 if []_this_name support is wanted */
/* #undef USE_TITAN */

/* Defined to 1 if []_this_name support is wanted */
#define USE_TWINFURY 1

/* Defined to 1 if lowlevel PCI drivers should support UIO */
#define USE_UIO 1

/* Defined to 1 if curses supports wide characters */
/* #undef USE_UNICODE */

/* Defined to 1 if lowlevel PCI drivers should support VFIO */
#define USE_VFIO 1

/* Defined to 1 if []_this_name support is wanted */
#define USE_X6500 1

/* Defined to 1 if []_this_name support is wanted */
#define USE_ZEUSMINER 1

/* Defined to 1 if []_this_name support is wanted */
#define USE_ZTEX 1

/* Version number of package */
#define VERSION "5.4.2"

/* Define to l, ll, u, ul, ull, etc., as suitable for constants of type
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/* #undef WCHAR_T_SUFFIX */

/* Define to l, ll, u, ul, ull, etc., as suitable for constants of type
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/* #undef WINT_T_SUFFIX */

/* Define if your platform is big endian */
/* #undef WORDS_BIGENDIAN */

/* Enable large inode numbers on Mac OS X 10.5.  */
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/* #undef bswap_16 */

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   __APPLE__ && __MACH__ test for MacOS X.
   __APPLE_CC__ tests for the Apple compiler and its version.
   __STDC_VERSION__ tests for the C99 mode.  */
#if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
# define __GNUC_STDC_INLINE__ 1
#endif

/* Define to the equivalent of the C99 'restrict' keyword, or to
   nothing if this is not supported.  Do not define if restrict is
   supported directly.  */
#define restrict __restrict
/* Work around a bug in Sun C++: it does not support _Restrict or
   __restrict__, even though the corresponding Sun C compiler ends up with
   "#define restrict _Restrict" or "#define restrict __restrict__" in the
   previous line.  Perhaps some future version of Sun C++ will work with
   restrict; if so, hopefully it defines __RESTRICT like Sun C does.  */
#if defined __SUNPRO_CC && !defined __RESTRICT
# define _Restrict
# define __restrict__
#endif

/* Define to `unsigned int' if <sys/types.h> does not define. */
/* #undef size_t */

/* Define to `int' if <sys/types.h> doesn't define. */
/* #undef uid_t */

/* Define as a marker that can be attached to declarations that might not
    be used.  This helps to reduce warnings, such as from
    GCC -Wunused-parameter.  */
#if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
# define _GL_UNUSED __attribute__ ((__unused__))
#else
# define _GL_UNUSED
#endif
/* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name
   is a misnomer outside of parameter lists.  */
#define _UNUSED_PARAMETER_ _GL_UNUSED

/* The __pure__ attribute was added in gcc 2.96.  */
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
#else
# define _GL_ATTRIBUTE_PURE /* empty */
#endif

/* The __const__ attribute was added in gcc 2.95.  */
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
# define _GL_ATTRIBUTE_CONST __attribute__ ((__const__))
#else
# define _GL_ATTRIBUTE_CONST /* empty */
#endif

#ifdef WIN32
#include "winhacks.h"
#endif

luke-jr / bfgminer

100% CPU usage if a device goes offline/disconnects #721