Compile zmq locally

dep/libzmq/src/clock.cpp

@@ -0,0 +1,253 @@
+/*
+    Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
+
+    This file is part of libzmq, the ZeroMQ core engine in C++.
+
+    libzmq is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License (LGPL) as published
+    by the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    As a special exception, the Contributors give you permission to link
+    this library with independent modules to produce an executable,
+    regardless of the license terms of these independent modules, and to
+    copy and distribute the resulting executable under terms of your choice,
+    provided that you also meet, for each linked independent module, the
+    terms and conditions of the license of that module. An independent
+    module is a module which is not derived from or based on this library.
+    If you modify this library, you must extend this exception to your
+    version of the library.
+
+    libzmq is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "precompiled.hpp"
+#include "clock.hpp"
+#include "likely.hpp"
+#include "config.hpp"
+#include "err.hpp"
+#include "mutex.hpp"
+
+#include <stddef.h>
+
+#if defined _MSC_VER
+#if defined _WIN32_WCE
+#include <cmnintrin.h>
+#else
+#include <intrin.h>
+#endif
+#endif
+
+#if !defined ZMQ_HAVE_WINDOWS
+#include <sys/time.h>
+#endif
+
+#if defined HAVE_CLOCK_GETTIME || defined HAVE_GETHRTIME
+#include <time.h>
+#endif
+
+#if defined ZMQ_HAVE_OSX
+#include <mach/clock.h>
+#include <mach/mach.h>
+#include <time.h>
+#include <sys/time.h>
+
+int alt_clock_gettime (int clock_id, timespec *ts)
+{
+    clock_serv_t cclock;
+    mach_timespec_t mts;
+    host_get_clock_service (mach_host_self (), clock_id, &cclock);
+    clock_get_time (cclock, &mts);
+    mach_port_deallocate (mach_task_self (), cclock);
+    ts->tv_sec = mts.tv_sec;
+    ts->tv_nsec = mts.tv_nsec;
+    return 0;
+}
+#endif
+
+#ifdef ZMQ_HAVE_WINDOWS
+typedef ULONGLONG (*f_compatible_get_tick_count64)();
+
+static zmq::mutex_t compatible_get_tick_count64_mutex;
+
+ULONGLONG compatible_get_tick_count64()
+{
+#ifdef ZMQ_HAVE_WINDOWS_UWP
+  const ULONGLONG result = ::GetTickCount64();
+  return result;
+#else
+  zmq::scoped_lock_t locker(compatible_get_tick_count64_mutex);
+
+  static DWORD s_wrap = 0;
+  static DWORD s_last_tick = 0;
+  const DWORD current_tick = ::GetTickCount();
+
+  if (current_tick < s_last_tick)
+    ++s_wrap;
+
+  s_last_tick = current_tick;
+  const ULONGLONG result = (static_cast<ULONGLONG>(s_wrap) << 32) + static_cast<ULONGLONG>(current_tick);
+
+  return result;
+#endif
+}
+
+f_compatible_get_tick_count64 init_compatible_get_tick_count64()
+{
+  f_compatible_get_tick_count64 func = NULL;
+#if !defined ZMQ_HAVE_WINDOWS_UWP
+
+  HMODULE module = ::LoadLibraryA("Kernel32.dll");
+  if (module != NULL)
+    func = reinterpret_cast<f_compatible_get_tick_count64>(::GetProcAddress(module, "GetTickCount64"));
+#endif
+  if (func == NULL)
+    func = compatible_get_tick_count64;
+
+#if !defined ZMQ_HAVE_WINDOWS_UWP
+  ::FreeLibrary(module);
+#endif
+
+  return func;
+}
+
+static f_compatible_get_tick_count64 my_get_tick_count64 = init_compatible_get_tick_count64();
+#endif
+
+zmq::clock_t::clock_t () :
+    last_tsc (rdtsc ()),
+#ifdef ZMQ_HAVE_WINDOWS
+    last_time (static_cast<uint64_t>((*my_get_tick_count64)()))
+#else
+    last_time (now_us () / 1000)
+#endif
+{
+}
+
+zmq::clock_t::~clock_t ()
+{
+}
+
+uint64_t zmq::clock_t::now_us ()
+{
+#if defined ZMQ_HAVE_WINDOWS
+
+    //  Get the high resolution counter's accuracy.
+    LARGE_INTEGER ticksPerSecond;
+    QueryPerformanceFrequency (&ticksPerSecond);
+
+    //  What time is it?
+    LARGE_INTEGER tick;
+    QueryPerformanceCounter (&tick);
+
+    //  Convert the tick number into the number of seconds
+    //  since the system was started.
+    double ticks_div = ticksPerSecond.QuadPart / 1000000.0;
+    return (uint64_t) (tick.QuadPart / ticks_div);
+
+#elif defined HAVE_CLOCK_GETTIME && defined CLOCK_MONOTONIC
+
+    //  Use POSIX clock_gettime function to get precise monotonic time.
+    struct timespec tv;
+
+#if defined ZMQ_HAVE_OSX && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200 // less than macOS 10.12
+    int rc = alt_clock_gettime (SYSTEM_CLOCK, &tv);
+#else
+    int rc = clock_gettime (CLOCK_MONOTONIC, &tv);
+#endif
+    // Fix case where system has clock_gettime but CLOCK_MONOTONIC is not supported.
+    // This should be a configuration check, but I looked into it and writing an
+    // AC_FUNC_CLOCK_MONOTONIC seems beyond my powers.
+    if( rc != 0) {
+        //  Use POSIX gettimeofday function to get precise time.
+        struct timeval tv;
+        int rc = gettimeofday (&tv, NULL);
+        errno_assert (rc == 0);
+        return (tv.tv_sec * (uint64_t) 1000000 + tv.tv_usec);
+    }
+    return (tv.tv_sec * (uint64_t) 1000000 + tv.tv_nsec / 1000);
+
+#elif defined HAVE_GETHRTIME
+
+    return (gethrtime () / 1000);
+
+#else
+
+    //  Use POSIX gettimeofday function to get precise time.
+    struct timeval tv;
+    int rc = gettimeofday (&tv, NULL);
+    errno_assert (rc == 0);
+    return (tv.tv_sec * (uint64_t) 1000000 + tv.tv_usec);
+
+#endif
+}
+
+uint64_t zmq::clock_t::now_ms ()
+{
+    uint64_t tsc = rdtsc ();
+
+    //  If TSC is not supported, get precise time and chop off the microseconds.
+    if (!tsc)
+    {
+#ifdef ZMQ_HAVE_WINDOWS
+        // Under Windows, now_us is not so reliable since QueryPerformanceCounter
+        // does not guarantee that it will use a hardware that offers a monotonic timer.
+        // So, lets use GetTickCount when GetTickCount64 is not available with an workaround
+        // to its 32 bit limitation.
+        return static_cast<uint64_t>((*my_get_tick_count64)());
+#else
+        return now_us () / 1000;
+#endif
+    }
+
+    //  If TSC haven't jumped back (in case of migration to a different
+    //  CPU core) and if not too much time elapsed since last measurement,
+    //  we can return cached time value.
+    if (likely (tsc - last_tsc <= (clock_precision / 2) && tsc >= last_tsc))
+        return last_time;
+
+    last_tsc = tsc;
+#ifdef ZMQ_HAVE_WINDOWS
+    last_time = static_cast<uint64_t>((*my_get_tick_count64)());
+#else
+    last_time = now_us () / 1000;
+#endif
+    return last_time;
+}
+
+uint64_t zmq::clock_t::rdtsc ()
+{
+#if (defined _MSC_VER && (defined _M_IX86 || defined _M_X64))
+    return __rdtsc ();
+#elif (defined __GNUC__ && (defined __i386__ || defined __x86_64__))
+    uint32_t low, high;
+    __asm__ volatile ("rdtsc" : "=a" (low), "=d" (high));
+    return (uint64_t) high << 32 | low;
+#elif (defined __SUNPRO_CC && (__SUNPRO_CC >= 0x5100) && (defined __i386 || \
+    defined __amd64 || defined __x86_64))
+    union {
+        uint64_t u64val;
+        uint32_t u32val [2];
+    } tsc;
+    asm("rdtsc" : "=a" (tsc.u32val [0]), "=d" (tsc.u32val [1]));
+    return tsc.u64val;
+#elif defined(__s390__)
+    uint64_t tsc;
+    asm("\tstck\t%0\n" : "=Q" (tsc) : : "cc");
+    return(tsc);
+#else
+    struct timespec ts;
+    #if defined ZMQ_HAVE_OSX && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200 // less than macOS 10.12
+        alt_clock_gettime (SYSTEM_CLOCK, &ts);
+    #else
+        clock_gettime (CLOCK_MONOTONIC, &ts);
+    #endif
+    return (uint64_t)(ts.tv_sec) * 1000000000 + ts.tv_nsec;
+#endif
+}