Mercurial > hg > truffle
annotate src/share/vm/code/compressedStream.hpp @ 17716:cdb71841f4bc
6498581: ThreadInterruptTest3 produces wrong output on Windows
Summary: There is race condition between os::interrupt and os::is_interrupted on Windows. In JVM_Sleep(Thread.sleep), check if thread gets interrupted, it may see interrupted but not really interrupted so cause spurious waking up (early return from sleep). Fix by checking if interrupt event really gets set thus prevent false return. For intrinsic of _isInterrupted, on Windows, go fastpath only on bit not set.
Reviewed-by: acorn, kvn
Contributed-by: david.holmes@oracle.com, yumin.qi@oracle.com
| author | minqi |
|---|---|
| date | Wed, 26 Feb 2014 15:20:41 -0800 |
| parents | f95d63e2154a |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_CODE_COMPRESSEDSTREAM_HPP |
| 26 #define SHARE_VM_CODE_COMPRESSEDSTREAM_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 | |
| 0 | 30 // Simple interface for filing out and filing in basic types |
| 31 // Used for writing out and reading in debugging information. | |
| 32 | |
| 33 class CompressedStream : public ResourceObj { | |
| 34 friend class VMStructs; | |
| 35 protected: | |
| 36 u_char* _buffer; | |
| 37 int _position; | |
| 38 | |
| 39 enum { | |
| 40 // Constants for UNSIGNED5 coding of Pack200 | |
| 41 lg_H = 6, H = 1<<lg_H, // number of high codes (64) | |
| 42 L = (1<<BitsPerByte)-H, // number of low codes (192) | |
| 43 MAX_i = 4 // bytes are numbered in (0..4), max 5 bytes | |
| 44 }; | |
| 45 | |
| 46 // these inlines are defined only in compressedStream.cpp | |
| 47 static inline juint encode_sign(jint value); // for Pack200 SIGNED5 | |
| 48 static inline jint decode_sign(juint value); // for Pack200 SIGNED5 | |
| 49 static inline juint reverse_int(juint bits); // to trim trailing float 0's | |
| 50 | |
| 51 public: | |
| 52 CompressedStream(u_char* buffer, int position = 0) { | |
| 53 _buffer = buffer; | |
| 54 _position = position; | |
| 55 } | |
| 56 | |
| 57 u_char* buffer() const { return _buffer; } | |
| 58 | |
| 59 // Positioning | |
| 60 int position() const { return _position; } | |
| 61 void set_position(int position) { _position = position; } | |
| 62 }; | |
| 63 | |
| 64 | |
| 65 class CompressedReadStream : public CompressedStream { | |
| 66 private: | |
| 67 inline u_char read() { return _buffer[_position++]; } | |
| 68 | |
| 69 jint read_int_mb(jint b0); // UNSIGNED5 coding, 2-5 byte cases | |
| 70 | |
| 71 public: | |
| 72 CompressedReadStream(u_char* buffer, int position = 0) | |
| 73 : CompressedStream(buffer, position) {} | |
| 74 | |
| 75 jboolean read_bool() { return (jboolean) read(); } | |
| 76 jbyte read_byte() { return (jbyte ) read(); } | |
| 77 jchar read_char() { return (jchar ) read_int(); } | |
| 78 jshort read_short() { return (jshort ) read_signed_int(); } | |
| 79 jint read_int() { jint b0 = read(); | |
| 80 if (b0 < L) return b0; | |
| 81 else return read_int_mb(b0); | |
| 82 } | |
| 83 jint read_signed_int(); | |
| 84 jfloat read_float(); // jfloat_cast(reverse_int(read_int())) | |
| 85 jdouble read_double(); // jdouble_cast(2*reverse_int(read_int)) | |
| 86 jlong read_long(); // jlong_from(2*read_signed_int()) | |
| 87 }; | |
| 88 | |
| 89 | |
| 90 class CompressedWriteStream : public CompressedStream { | |
| 91 private: | |
| 92 bool full() { | |
| 93 return _position >= _size; | |
| 94 } | |
| 95 void store(u_char b) { | |
| 96 _buffer[_position++] = b; | |
| 97 } | |
| 98 void write(u_char b) { | |
| 99 if (full()) grow(); | |
| 100 store(b); | |
| 101 } | |
| 102 void grow(); | |
| 103 | |
| 104 void write_int_mb(jint value); // UNSIGNED5 coding, 1-5 byte cases | |
| 105 | |
| 106 protected: | |
| 107 int _size; | |
| 108 | |
| 109 public: | |
| 110 CompressedWriteStream(int initial_size); | |
| 111 CompressedWriteStream(u_char* buffer, int initial_size, int position = 0) | |
| 112 : CompressedStream(buffer, position) { _size = initial_size; } | |
| 113 | |
| 114 void write_bool(jboolean value) { write(value); } | |
| 115 void write_byte(jbyte value) { write(value); } | |
| 116 void write_char(jchar value) { write_int(value); } | |
| 117 void write_short(jshort value) { write_signed_int(value); } | |
| 118 void write_int(jint value) { if ((juint)value < L && !full()) | |
| 119 store((u_char)value); | |
| 120 else write_int_mb(value); } | |
| 121 void write_signed_int(jint value); // write_int(encode_sign(value)) | |
| 122 void write_float(jfloat value); // write_int(reverse_int(jint_cast(v))) | |
| 123 void write_double(jdouble value); // write_int(reverse_int(<low,high>)) | |
| 124 void write_long(jlong value); // write_signed_int(<low,high>) | |
| 125 }; | |
| 1972 | 126 |
| 127 #endif // SHARE_VM_CODE_COMPRESSEDSTREAM_HPP |