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| 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. |
| 2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
| 3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
| 4 // met: | 4 // met: |
| 5 // | 5 // |
| 6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
| 7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
| 8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
| 9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
| 10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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| 117 class PreallocatedMemoryThread: public Thread { | 117 class PreallocatedMemoryThread: public Thread { |
| 118 public: | 118 public: |
| 119 PreallocatedMemoryThread() : keep_running_(true) { | 119 PreallocatedMemoryThread() : keep_running_(true) { |
| 120 wait_for_ever_semaphore_ = OS::CreateSemaphore(0); | 120 wait_for_ever_semaphore_ = OS::CreateSemaphore(0); |
| 121 data_ready_semaphore_ = OS::CreateSemaphore(0); | 121 data_ready_semaphore_ = OS::CreateSemaphore(0); |
| 122 } | 122 } |
| 123 | 123 |
| 124 // When the thread starts running it will allocate a fixed number of bytes | 124 // When the thread starts running it will allocate a fixed number of bytes |
| 125 // on the stack and publish the location of this memory for others to use. | 125 // on the stack and publish the location of this memory for others to use. |
| 126 void Run() { | 126 void Run() { |
| 127 char local_buffer[16 * 1024]; | 127 EmbeddedVector<char, 16 * 1024> local_buffer; |
| 128 | 128 |
| 129 // Initialize the buffer with a known good value. | 129 // Initialize the buffer with a known good value. |
| 130 strncpy(local_buffer, "Trace data was not generated.\n", | 130 OS::StrNCpy(local_buffer, "Trace data was not generated.\n", |
| 131 sizeof(local_buffer)); | 131 local_buffer.length()); |
| 132 | 132 |
| 133 // Publish the local buffer and signal its availability. | 133 // Publish the local buffer and signal its availability. |
| 134 data_ = &local_buffer[0]; | 134 data_ = &local_buffer[0]; |
| 135 length_ = sizeof(local_buffer); | 135 length_ = sizeof(local_buffer); |
| 136 data_ready_semaphore_->Signal(); | 136 data_ready_semaphore_->Signal(); |
| 137 | 137 |
| 138 while (keep_running_) { | 138 while (keep_running_) { |
| 139 // This thread will wait here until the end of time. | 139 // This thread will wait here until the end of time. |
| 140 wait_for_ever_semaphore_->Wait(); | 140 wait_for_ever_semaphore_->Wait(); |
| 141 } | 141 } |
| 142 | 142 |
| 143 // Make sure we access the buffer after the wait to remove all possibility | 143 // Make sure we access the buffer after the wait to remove all possibility |
| 144 // of it being optimized away. | 144 // of it being optimized away. |
| 145 strncpy(local_buffer, "PreallocatedMemoryThread shutting down.\n", | 145 OS::StrNCpy(local_buffer, "PreallocatedMemoryThread shutting down.\n", |
| 146 sizeof(local_buffer)); | 146 local_buffer.length()); |
| 147 } | 147 } |
| 148 | 148 |
| 149 static char* data() { | 149 static char* data() { |
| 150 if (data_ready_semaphore_ != NULL) { | 150 if (data_ready_semaphore_ != NULL) { |
| 151 // Initial access is guarded until the data has been published. | 151 // Initial access is guarded until the data has been published. |
| 152 data_ready_semaphore_->Wait(); | 152 data_ready_semaphore_->Wait(); |
| 153 delete data_ready_semaphore_; | 153 delete data_ready_semaphore_; |
| 154 data_ready_semaphore_ = NULL; | 154 data_ready_semaphore_ = NULL; |
| 155 } | 155 } |
| 156 return data_; | 156 return data_; |
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| 889 Top::break_access_->Lock(); | 889 Top::break_access_->Lock(); |
| 890 } | 890 } |
| 891 | 891 |
| 892 | 892 |
| 893 ExecutionAccess::~ExecutionAccess() { | 893 ExecutionAccess::~ExecutionAccess() { |
| 894 Top::break_access_->Unlock(); | 894 Top::break_access_->Unlock(); |
| 895 } | 895 } |
| 896 | 896 |
| 897 | 897 |
| 898 } } // namespace v8::internal | 898 } } // namespace v8::internal |
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