94 * @param update the new value
95 * @return true if successful. False return indicates that
96 * the actual value was not equal to the expected value.
97 */
98 public final boolean compareAndSet(boolean expect, boolean update) {
99 int e = expect ? 1 : 0;
100 int u = update ? 1 : 0;
101 return unsafe.compareAndSwapInt(this, valueOffset, e, u);
102 }
103
104 /**
105 * Atomically sets the value to the given updated value
106 * if the current value {@code ==} the expected value.
107 *
108 * <p>May <a href="package-summary.html#Spurious">fail spuriously</a>
109 * and does not provide ordering guarantees, so is only rarely an
110 * appropriate alternative to {@code compareAndSet}.
111 *
112 * @param expect the expected value
113 * @param update the new value
114 * @return true if successful.
115 */
116 public boolean weakCompareAndSet(boolean expect, boolean update) {
117 int e = expect ? 1 : 0;
118 int u = update ? 1 : 0;
119 return unsafe.compareAndSwapInt(this, valueOffset, e, u);
120 }
121
122 /**
123 * Unconditionally sets to the given value.
124 *
125 * @param newValue the new value
126 */
127 public final void set(boolean newValue) {
128 value = newValue ? 1 : 0;
129 }
130
131 /**
132 * Eventually sets to the given value.
133 *
134 * @param newValue the new value
135 * @since 1.6
136 */
137 public final void lazySet(boolean newValue) {
138 int v = newValue ? 1 : 0;
139 unsafe.putOrderedInt(this, valueOffset, v);
140 }
141
142 /**
143 * Atomically sets to the given value and returns the previous value.
144 *
145 * @param newValue the new value
146 * @return the previous value
147 */
148 public final boolean getAndSet(boolean newValue) {
149 for (;;) {
150 boolean current = get();
151 if (compareAndSet(current, newValue))
152 return current;
153 }
154 }
155
156 /**
157 * Returns the String representation of the current value.
158 * @return the String representation of the current value.
159 */
160 public String toString() {
161 return Boolean.toString(get());
162 }
163
164 }
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94 * @param update the new value
95 * @return true if successful. False return indicates that
96 * the actual value was not equal to the expected value.
97 */
98 public final boolean compareAndSet(boolean expect, boolean update) {
99 int e = expect ? 1 : 0;
100 int u = update ? 1 : 0;
101 return unsafe.compareAndSwapInt(this, valueOffset, e, u);
102 }
103
104 /**
105 * Atomically sets the value to the given updated value
106 * if the current value {@code ==} the expected value.
107 *
108 * <p>May <a href="package-summary.html#Spurious">fail spuriously</a>
109 * and does not provide ordering guarantees, so is only rarely an
110 * appropriate alternative to {@code compareAndSet}.
111 *
112 * @param expect the expected value
113 * @param update the new value
114 * @return true if successful
115 */
116 public boolean weakCompareAndSet(boolean expect, boolean update) {
117 int e = expect ? 1 : 0;
118 int u = update ? 1 : 0;
119 return unsafe.compareAndSwapInt(this, valueOffset, e, u);
120 }
121
122 /**
123 * Unconditionally sets to the given value.
124 *
125 * @param newValue the new value
126 */
127 public final void set(boolean newValue) {
128 value = newValue ? 1 : 0;
129 }
130
131 /**
132 * Eventually sets to the given value.
133 *
134 * @param newValue the new value
135 * @since 1.6
136 */
137 public final void lazySet(boolean newValue) {
138 int v = newValue ? 1 : 0;
139 unsafe.putOrderedInt(this, valueOffset, v);
140 }
141
142 /**
143 * Atomically sets to the given value and returns the previous value.
144 *
145 * @param newValue the new value
146 * @return the previous value
147 */
148 public final boolean getAndSet(boolean newValue) {
149 boolean prev;
150 do {
151 prev = get();
152 } while (!compareAndSet(prev, newValue));
153 return prev;
154 }
155
156 /**
157 * Returns the String representation of the current value.
158 * @return the String representation of the current value
159 */
160 public String toString() {
161 return Boolean.toString(get());
162 }
163
164 }
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