44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
#ifndef _LINUX_FUTEX_H
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#define _LINUX_FUTEX_H
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/* Second argument to futex syscall */
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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#define FUTEX_FD 2
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#define FUTEX_REQUEUE 3
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#define FUTEX_CMP_REQUEUE 4
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#define FUTEX_WAKE_OP 5
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long do_futex(unsigned long uaddr, int op, int val,
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unsigned long timeout, unsigned long uaddr2, int val2,
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int val3);
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#define FUTEX_OP_SET 0 /* *(int *)UADDR2 = OPARG; */
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#define FUTEX_OP_ADD 1 /* *(int *)UADDR2 += OPARG; */
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#define FUTEX_OP_OR 2 /* *(int *)UADDR2 |= OPARG; */
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#define FUTEX_OP_ANDN 3 /* *(int *)UADDR2 &= ~OPARG; */
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#define FUTEX_OP_XOR 4 /* *(int *)UADDR2 ^= OPARG; */
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#define FUTEX_OP_OPARG_SHIFT 8 /* Use (1 << OPARG) instead of OPARG. */
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#define FUTEX_OP_CMP_EQ 0 /* if (oldval == CMPARG) wake */
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#define FUTEX_OP_CMP_NE 1 /* if (oldval != CMPARG) wake */
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#define FUTEX_OP_CMP_LT 2 /* if (oldval < CMPARG) wake */
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#define FUTEX_OP_CMP_LE 3 /* if (oldval <= CMPARG) wake */
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#define FUTEX_OP_CMP_GT 4 /* if (oldval > CMPARG) wake */
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#define FUTEX_OP_CMP_GE 5 /* if (oldval >= CMPARG) wake */
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/* FUTEX_WAKE_OP will perform atomically
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int oldval = *(int *)UADDR2;
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*(int *)UADDR2 = oldval OP OPARG;
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if (oldval CMP CMPARG)
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wake UADDR2; */
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#define FUTEX_OP(op, oparg, cmp, cmparg) \
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(((op & 0xf) << 28) | ((cmp & 0xf) << 24) \
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| ((oparg & 0xfff) << 12) | (cmparg & 0xfff))
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#endif
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