LCOV - code coverage report
Current view: top level - lib/Support/Unix - Threading.inc (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 20 27 74.1 %
Date: 2017-09-14 15:23:50 Functions: 4 6 66.7 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===- Unix/Threading.inc - Unix Threading Implementation ----- -*- C++ -*-===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : //
      10             : // This file provides the Unix specific implementation of Threading functions.
      11             : //
      12             : //===----------------------------------------------------------------------===//
      13             : 
      14             : #include "llvm/ADT/SmallString.h"
      15             : #include "llvm/ADT/Twine.h"
      16             : 
      17             : #if defined(__APPLE__)
      18             : #include <mach/mach_init.h>
      19             : #include <mach/mach_port.h>
      20             : #endif
      21             : 
      22             : #include <pthread.h>
      23             : 
      24             : #if defined(__FreeBSD__)
      25             : #include <pthread_np.h> // For pthread_getthreadid_np()
      26             : #endif
      27             : 
      28             : #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
      29             : #include <errno.h>
      30             : #include <sys/sysctl.h>
      31             : #include <sys/user.h>
      32             : #include <unistd.h>
      33             : #endif
      34             : 
      35             : #if defined(__NetBSD__)
      36             : #include <lwp.h> // For _lwp_self()
      37             : #endif
      38             : 
      39             : #if defined(__linux__)
      40             : #include <sys/syscall.h> // For syscall codes
      41             : #include <unistd.h>      // For syscall()
      42             : #endif
      43             : 
      44             : namespace {
      45             :   struct ThreadInfo {
      46             :     void(*UserFn)(void *);
      47             :     void *UserData;
      48             :   };
      49             : }
      50             : 
      51        4462 : static void *ExecuteOnThread_Dispatch(void *Arg) {
      52        4462 :   ThreadInfo *TI = reinterpret_cast<ThreadInfo*>(Arg);
      53        4462 :   TI->UserFn(TI->UserData);
      54        4462 :   return nullptr;
      55             : }
      56             : 
      57        4462 : void llvm::llvm_execute_on_thread(void(*Fn)(void*), void *UserData,
      58             :   unsigned RequestedStackSize) {
      59        4462 :   ThreadInfo Info = { Fn, UserData };
      60             :   pthread_attr_t Attr;
      61             :   pthread_t Thread;
      62             : 
      63             :   // Construct the attributes object.
      64        4462 :   if (::pthread_attr_init(&Attr) != 0)
      65           0 :     return;
      66             : 
      67             :   // Set the requested stack size, if given.
      68        4462 :   if (RequestedStackSize != 0) {
      69        3473 :     if (::pthread_attr_setstacksize(&Attr, RequestedStackSize) != 0)
      70             :       goto error;
      71             :   }
      72             : 
      73             :   // Construct and execute the thread.
      74        4462 :   if (::pthread_create(&Thread, &Attr, ExecuteOnThread_Dispatch, &Info) != 0)
      75             :     goto error;
      76             : 
      77             :   // Wait for the thread and clean up.
      78        4462 :   ::pthread_join(Thread, nullptr);
      79             : 
      80        4462 : error:
      81        4462 :   ::pthread_attr_destroy(&Attr);
      82             : }
      83             : 
      84             : 
      85           0 : uint64_t llvm::get_threadid() {
      86             : #if defined(__APPLE__)
      87             :   // Calling "mach_thread_self()" bumps the reference count on the thread
      88             :   // port, so we need to deallocate it. mach_task_self() doesn't bump the ref
      89             :   // count.
      90             :   thread_port_t Self = mach_thread_self();
      91             :   mach_port_deallocate(mach_task_self(), Self);
      92             :   return Self;
      93             : #elif defined(__FreeBSD__)
      94             :   return uint64_t(pthread_getthreadid_np());
      95             : #elif defined(__NetBSD__)
      96             :   return uint64_t(_lwp_self());
      97             : #elif defined(__ANDROID__)
      98             :   return uint64_t(gettid());
      99             : #elif defined(__linux__)
     100           0 :   return uint64_t(syscall(SYS_gettid));
     101             : #elif defined(LLVM_ON_WIN32)
     102             :   return uint64_t(::GetCurrentThreadId());
     103             : #else
     104             :   return uint64_t(pthread_self());
     105             : #endif
     106             : }
     107             : 
     108             : 
     109             : static constexpr uint32_t get_max_thread_name_length_impl() {
     110             : #if defined(__NetBSD__)
     111             :   return PTHREAD_MAX_NAMELEN_NP;
     112             : #elif defined(__APPLE__)
     113             :   return 64;
     114             : #elif defined(__linux__)
     115             : #if HAVE_PTHREAD_SETNAME_NP
     116             :   return 16;
     117             : #else
     118             :   return 0;
     119             : #endif
     120             : #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
     121             :   return 16;
     122             : #else
     123             :   return 0;
     124             : #endif
     125             : }
     126             : 
     127         164 : uint32_t llvm::get_max_thread_name_length() {
     128         164 :   return get_max_thread_name_length_impl();
     129             : }
     130             : 
     131         133 : void llvm::set_thread_name(const Twine &Name) {
     132             :   // Make sure the input is null terminated.
     133         266 :   SmallString<64> Storage;
     134         133 :   StringRef NameStr = Name.toNullTerminatedStringRef(Storage);
     135             : 
     136             :   // Truncate from the beginning, not the end, if the specified name is too
     137             :   // long.  For one, this ensures that the resulting string is still null
     138             :   // terminated, but additionally the end of a long thread name will usually
     139             :   // be more unique than the beginning, since a common pattern is for similar
     140             :   // threads to share a common prefix.
     141         133 :   if (get_max_thread_name_length() > 0)
     142           0 :     NameStr = NameStr.take_back(get_max_thread_name_length());
     143             :   (void)NameStr;
     144             : #if defined(__linux__)
     145             : #if (defined(__GLIBC__) && defined(_GNU_SOURCE)) || defined(__ANDROID__)
     146             : #if HAVE_PTHREAD_SETNAME_NP
     147             :   ::pthread_setname_np(::pthread_self(), NameStr.data());
     148             : #endif
     149             : #endif
     150             : #elif defined(__FreeBSD__)
     151             :   ::pthread_set_name_np(::pthread_self(), NameStr.data());
     152             : #elif defined(__NetBSD__)
     153             :   ::pthread_setname_np(::pthread_self(), "%s",
     154             :     const_cast<char *>(NameStr.data()));
     155             : #elif defined(__APPLE__)
     156             :   ::pthread_setname_np(NameStr.data());
     157             : #endif
     158         133 : }
     159             : 
     160           0 : void llvm::get_thread_name(SmallVectorImpl<char> &Name) {
     161           0 :   Name.clear();
     162             : 
     163             : #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
     164             :   int pid = ::getpid();
     165             :   uint64_t tid = get_threadid();
     166             : 
     167             :   struct kinfo_proc *kp = nullptr, *nkp;
     168             :   size_t len = 0;
     169             :   int error;
     170             :   int ctl[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PID | KERN_PROC_INC_THREAD,
     171             :     (int)pid };
     172             : 
     173             :   while (1) {
     174             :     error = sysctl(ctl, 4, kp, &len, nullptr, 0);
     175             :     if (kp == nullptr || (error != 0 && errno == ENOMEM)) {
     176             :       // Add extra space in case threads are added before next call.
     177             :       len += sizeof(*kp) + len / 10;
     178             :       nkp = (struct kinfo_proc *)realloc(kp, len);
     179             :       if (nkp == nullptr) {
     180             :         free(kp);
     181             :         return;
     182             :       }
     183             :       kp = nkp;
     184             :       continue;
     185             :     }
     186             :     if (error != 0)
     187             :       len = 0;
     188             :     break;
     189             :   }
     190             : 
     191             :   for (size_t i = 0; i < len / sizeof(*kp); i++) {
     192             :     if (kp[i].ki_tid == (lwpid_t)tid) {
     193             :       Name.append(kp[i].ki_tdname, kp[i].ki_tdname + strlen(kp[i].ki_tdname));
     194             :       break;
     195             :     }
     196             :   }
     197             :   free(kp);
     198             :   return;
     199             : #elif defined(__NetBSD__)
     200             :   constexpr uint32_t len = get_max_thread_name_length_impl();
     201             :   char buf[len];
     202             :   ::pthread_getname_np(::pthread_self(), buf, len);
     203             : 
     204             :   Name.append(buf, buf + strlen(buf));
     205             : #elif defined(__linux__)
     206             : #if (defined(__GLIBC__) && defined(_GNU_SOURCE)) || defined(__ANDROID__)
     207             : #if HAVE_PTHREAD_GETNAME_NP
     208             :   constexpr uint32_t len = get_max_thread_name_length_impl();
     209             :   char Buffer[len];
     210             :   if (0 == ::pthread_getname_np(::pthread_self(), Buffer, len))
     211             :     Name.append(Buffer, Buffer + strlen(Buffer));
     212             : #endif
     213             : #endif
     214             : #endif
     215           0 : }

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