1 //===-- Process.cpp - Implement OS Process Concept --------------*- 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 header file implements the operating system Process concept. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/Config/config.h" 15 #include "llvm/Support/Process.h" 16 #include "llvm/Support/ErrorHandling.h" 17 18 namespace llvm { 19 using namespace sys; 20 21 //===----------------------------------------------------------------------===// 22 //=== WARNING: Implementation here must contain only TRULY operating system 23 //=== independent code. 24 //===----------------------------------------------------------------------===// 25 26 // Empty virtual destructor to anchor the vtable for the process class. 27 process::~process() {} 28 29 self_process *process::get_self() { 30 // Use a function local static for thread safe initialization and allocate it 31 // as a raw pointer to ensure it is never destroyed. 32 static self_process *SP = new self_process(); 33 34 return SP; 35 } 36 37 // The destructor for the self_process subclass must never actually be 38 // executed. There should be at most one instance of this class, and that 39 // instance should live until the process terminates to avoid the potential for 40 // racy accesses during shutdown. 41 self_process::~self_process() { 42 llvm_unreachable("This destructor must never be executed!"); 43 } 44 45 } 46 47 // Include the platform-specific parts of this class. 48 #ifdef LLVM_ON_UNIX 49 #include "Unix/Process.inc" 50 #endif 51 #ifdef LLVM_ON_WIN32 52 #include "Windows/Process.inc" 53 #endif 54