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comparison src/share/vm/utilities/ostream.hpp @ 2263:5841dc1964f0

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7021531: lock ordering problems after fix for 6354181 Reviewed-by: kvn, jrose
author never
date Tue, 22 Feb 2011 15:26:36 -0800
parents d8a72fbc4be7
children 1d1603768966
comparison
equal deleted inserted replaced
2262:6bbaedb03534 2263:5841dc1964f0
121 extern outputStream* tty; // tty output 121 extern outputStream* tty; // tty output
122 extern outputStream* gclog_or_tty; // stream for gc log if -Xloggc:<f>, or tty 122 extern outputStream* gclog_or_tty; // stream for gc log if -Xloggc:<f>, or tty
123 123
124 // advisory locking for the shared tty stream: 124 // advisory locking for the shared tty stream:
125 class ttyLocker: StackObj { 125 class ttyLocker: StackObj {
126 friend class ttyUnlocker;
126 private: 127 private:
127 intx _holder; 128 intx _holder;
128 129
129 public: 130 public:
130 static intx hold_tty(); // returns a "holder" token 131 static intx hold_tty(); // returns a "holder" token
131 static void release_tty(intx holder); // must witness same token 132 static void release_tty(intx holder); // must witness same token
133 static bool release_tty_if_locked(); // returns true if lock was released
132 static void break_tty_lock_for_safepoint(intx holder); 134 static void break_tty_lock_for_safepoint(intx holder);
133 135
134 ttyLocker() { _holder = hold_tty(); } 136 ttyLocker() { _holder = hold_tty(); }
135 ~ttyLocker() { release_tty(_holder); } 137 ~ttyLocker() { release_tty(_holder); }
138 };
139
140 // Release the tty lock if it's held and reacquire it if it was
141 // locked. Used to avoid lock ordering problems.
142 class ttyUnlocker: StackObj {
143 private:
144 bool _was_locked;
145 public:
146 ttyUnlocker() {
147 _was_locked = ttyLocker::release_tty_if_locked();
148 }
149 ~ttyUnlocker() {
150 if (_was_locked) {
151 ttyLocker::hold_tty();
152 }
153 }
136 }; 154 };
137 155
138 // for writing to strings; buffer will expand automatically 156 // for writing to strings; buffer will expand automatically
139 class stringStream : public outputStream { 157 class stringStream : public outputStream {
140 protected: 158 protected: