Merge pull request #3813 from tgross35/backport-futex-constants

[0.2] add FUTEX_WAITERS, FUTEX_OWNER_DIED and FUTEX_TID_MASK to linux

Author: tgross35

libc-test/semver/linux.txt

@@ -824,13 +824,16 @@ FUTEX_OP_OPARG_SHIFT
 FUTEX_OP_OR
 FUTEX_OP_SET
 FUTEX_OP_XOR
+FUTEX_OWNER_DIED
 FUTEX_PRIVATE_FLAG
 FUTEX_REQUEUE
+FUTEX_TID_MASK
 FUTEX_TRYLOCK_PI
 FUTEX_UNLOCK_PI
 FUTEX_WAIT
 FUTEX_WAIT_BITSET
 FUTEX_WAIT_REQUEUE_PI
+FUTEX_WAITERS
 FUTEX_WAKE
 FUTEX_WAKE_BITSET
 FUTEX_WAKE_OP

src/unix/linux_like/linux/mod.rs

@@ -4135,6 +4135,7 @@ pub const FAN_NOFD: ::c_int = -1;
 pub const FAN_NOPIDFD: ::c_int = FAN_NOFD;
 pub const FAN_EPIDFD: ::c_int = -2;
 
+// linux/futex.h
 pub const FUTEX_WAIT: ::c_int = 0;
 pub const FUTEX_WAKE: ::c_int = 1;
 pub const FUTEX_FD: ::c_int = 2;
@@ -4154,6 +4155,10 @@ pub const FUTEX_PRIVATE_FLAG: ::c_int = 128;
 pub const FUTEX_CLOCK_REALTIME: ::c_int = 256;
 pub const FUTEX_CMD_MASK: ::c_int = !(FUTEX_PRIVATE_FLAG | FUTEX_CLOCK_REALTIME);
 
+pub const FUTEX_WAITERS: u32 = 0x80000000;
+pub const FUTEX_OWNER_DIED: u32 = 0x40000000;
+pub const FUTEX_TID_MASK: u32 = 0x3fffffff;
+
 pub const FUTEX_BITSET_MATCH_ANY: ::c_int = 0xffffffff;
 
 pub const FUTEX_OP_SET: ::c_int = 0;