eb381b9444
The RandomNumberGenerator is a pseudorandom number generator with 48-bit state. It is properly seeded using either (1) the --random-seed if specified, or (2) the entropy_source function if configured, or (3) /dev/urandom if available, or (4) falls back to Time and TimeTicks based seeding. Each Isolate now contains a RandomNumberGenerator, which replaces the previous private_random_seed. Every native context still has its own random_seed. But this random seed is now properly initialized during bootstrapping, instead of on-demand initialization. This will allow us to cleanup and speedup the HRandom implementation quite a lot (this is delayed for a followup CL)! Also stop messing with the system rand()/random(), which should not be done from a library anyway! We probably re-seeded the libc rand()/random() after the application (i.e. Chrome) already seeded it (with better entropy than what we used). Another followup CL will replace the use of the per-isolate random number generator for the address randomization and thereby get rid of the Isolate::UncheckedCurrent() usage in the platform code. TEST=cctest/test-random-number-generator,cctest/test-random R=mstarzinger@chromium.org Review URL: https://codereview.chromium.org/23548024 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16612 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
59 lines
2.3 KiB
C++
59 lines
2.3 KiB
C++
// Copyright 2006-2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Tests of the TokenLock class from lock.h
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#include <pthread.h>
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#include <stdlib.h>
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#include <unistd.h> // for usleep()
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#include "v8.h"
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#include "platform.h"
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#include "cctest.h"
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using namespace ::v8::internal;
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TEST(VirtualMemory) {
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VirtualMemory* vm = new VirtualMemory(1 * MB);
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CHECK(vm->IsReserved());
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void* block_addr = vm->address();
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size_t block_size = 4 * KB;
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CHECK(vm->Commit(block_addr, block_size, false));
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// Check whether we can write to memory.
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int* addr = static_cast<int*>(block_addr);
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addr[KB-1] = 2;
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CHECK(vm->Uncommit(block_addr, block_size));
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delete vm;
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}
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TEST(GetCurrentProcessId) {
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CHECK_EQ(static_cast<int>(getpid()), OS::GetCurrentProcessId());
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}
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