Remove OS(QNX) support.

Source/wtf/OSAllocatorPosix.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 20 matching lines @@
 #include "PageAllocation.h"
 #include <errno.h>
 #include <sys/mman.h>
 #include <wtf/Assertions.h>
 #include <wtf/UnusedParam.h>
 
 namespace WTF {
 
 void* OSAllocator::reserveUncommitted(size_t bytes, Usage usage, bool writable, bool executable, bool includesGuardPages)
 {
-#if OS(QNX)
-    // Reserve memory with PROT_NONE and MAP_LAZY so it isn't committed now.
-    void* result = mmap(0, bytes, PROT_NONE, MAP_LAZY | MAP_PRIVATE | MAP_ANON, -1, 0);
-    if (result == MAP_FAILED)
-        CRASH();
-#elif OS(LINUX)
+#if OS(LINUX)
     UNUSED_PARAM(usage);
     UNUSED_PARAM(writable);
     UNUSED_PARAM(executable);
     UNUSED_PARAM(includesGuardPages);
 
     void* result = mmap(0, bytes, PROT_NONE, MAP_NORESERVE | MAP_PRIVATE | MAP_ANON, -1, 0);
     if (result == MAP_FAILED)
         CRASH();
     madvise(result, bytes, MADV_DONTNEED);
 #else
     void* result = reserveAndCommit(bytes, usage, writable, executable, includesGuardPages);
 #if HAVE(MADV_FREE_REUSE)
     // To support the "reserve then commit" model, we have to initially decommit.
     while (madvise(result, bytes, MADV_FREE_REUSABLE) == -1 && errno == EAGAIN) { }
 #endif
 
-#endif // OS(QNX)
+#endif // OS(LINUX)
 
     return result;
 }
 
 void* OSAllocator::reserveAndCommit(size_t bytes, Usage usage, bool writable, bool executable, bool includesGuardPages)
 {
     // All POSIX reservations start out logically committed.
     int protection = PROT_READ;
     if (writable)
         protection |= PROT_WRITE;
@@ skipping 45 matching lines @@
         // breaks the madvise based mechanism we use to return physical memory
         // to the OS.
         mmap(result, pageSize(), PROT_NONE, MAP_FIXED | MAP_PRIVATE | MAP_ANON, fd, 0);
         mmap(static_cast<char*>(result) + bytes - pageSize(), pageSize(), PROT_NONE, MAP_FIXED | MAP_PRIVATE | MAP_ANON, fd, 0);
     }
     return result;
 }
 
 void OSAllocator::commit(void* address, size_t bytes, bool writable, bool executable)
 {
-#if OS(QNX)
+#if OS(LINUX)
     int protection = PROT_READ;
     if (writable)
         protection |= PROT_WRITE;
-    if (executable)
-        protection |= PROT_EXEC;
-    if (MAP_FAILED == mmap(address, bytes, protection, MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0))
-        CRASH();
-#elif OS(LINUX)
-    int protection = PROT_READ;
-    if (writable)
-        protection |= PROT_WRITE;
     if (executable)
         protection |= PROT_EXEC;
     if (mprotect(address, bytes, protection))
         CRASH();
     madvise(address, bytes, MADV_WILLNEED);
 #elif HAVE(MADV_FREE_REUSE)
     UNUSED_PARAM(writable);
     UNUSED_PARAM(executable);
     while (madvise(address, bytes, MADV_FREE_REUSE) == -1 && errno == EAGAIN) { }
 #else
     // Non-MADV_FREE_REUSE reservations automatically commit on demand.
     UNUSED_PARAM(address);
     UNUSED_PARAM(bytes);
     UNUSED_PARAM(writable);
     UNUSED_PARAM(executable);
 #endif
 }
 
 void OSAllocator::decommit(void* address, size_t bytes)
 {
-#if OS(QNX)
-    // Use PROT_NONE and MAP_LAZY to decommit the pages.
-    mmap(address, bytes, PROT_NONE, MAP_FIXED | MAP_LAZY | MAP_PRIVATE | MAP_ANON, -1, 0);
-#elif OS(LINUX)
+#if OS(LINUX)
     madvise(address, bytes, MADV_DONTNEED);
     if (mprotect(address, bytes, PROT_NONE))
         CRASH();
 #elif HAVE(MADV_FREE_REUSE)
     while (madvise(address, bytes, MADV_FREE_REUSABLE) == -1 && errno == EAGAIN) { }
 #elif HAVE(MADV_FREE)
     while (madvise(address, bytes, MADV_FREE) == -1 && errno == EAGAIN) { }
 #elif HAVE(MADV_DONTNEED)
     while (madvise(address, bytes, MADV_DONTNEED) == -1 && errno == EAGAIN) { }
 #else
     UNUSED_PARAM(address);
     UNUSED_PARAM(bytes);
 #endif
 }
 
 void OSAllocator::releaseDecommitted(void* address, size_t bytes)
 {
     int result = munmap(address, bytes);
     if (result == -1)
         CRASH();
 }
 
 } // namespace WTF
 
 #endif // OS(UNIX)