Auto merge of #633 - main--:rwlockattr, r=alexcrichton

Add pthread_rwlockattr APIs

I'm basically trying to mirror the existing code for pthread_mutexattr.

Hopefully the non-linux parts are correct - finding the right definitions is rather confusing and occasionally even contradicts existing definitions (e.g. [this](https://github.com/practicalswift/osx/blob/a26375e7b3e01c83e26a23977f909438ed9b31b4/src/libpthread/src/internal.h#L295) `pthread_condattr_t` doesn't match #335).

src/unix/bsd/apple/b32.rs

@@ -14,6 +14,7 @@ pub const __PTHREAD_MUTEX_SIZE__: usize = 40;
 pub const __PTHREAD_COND_SIZE__: usize = 24;
 pub const __PTHREAD_CONDATTR_SIZE__: usize = 4;
 pub const __PTHREAD_RWLOCK_SIZE__: usize = 124;
+pub const __PTHREAD_RWLOCKATTR_SIZE__: usize = 12;
 
 pub const TIOCTIMESTAMP: ::c_ulong = 0x40087459;
 pub const TIOCDCDTIMESTAMP: ::c_ulong = 0x40087458;

src/unix/bsd/apple/b64.rs

@@ -14,6 +14,7 @@ pub const __PTHREAD_MUTEX_SIZE__: usize = 56;
 pub const __PTHREAD_COND_SIZE__: usize = 40;
 pub const __PTHREAD_CONDATTR_SIZE__: usize = 8;
 pub const __PTHREAD_RWLOCK_SIZE__: usize = 192;
+pub const __PTHREAD_RWLOCKATTR_SIZE__: usize = 16;
 
 pub const TIOCTIMESTAMP: ::c_ulong = 0x40107459;
 pub const TIOCDCDTIMESTAMP: ::c_ulong = 0x40107458;

src/unix/bsd/apple/mod.rs

@@ -146,6 +146,11 @@ s! {
         __opaque: [u8; __PTHREAD_RWLOCK_SIZE__],
     }
 
+    pub struct pthread_rwlockattr_t {
+        __sig: ::c_long,
+        __opaque: [u8; __PTHREAD_RWLOCKATTR_SIZE__],
+    }
+
     pub struct siginfo_t {
         pub si_signo: ::c_int,
         pub si_errno: ::c_int,
@@ -804,6 +809,8 @@ pub const _SC_XOPEN_UNIX: ::c_int = 115;
 pub const _SC_XOPEN_VERSION: ::c_int = 116;
 pub const _SC_XOPEN_XCU_VERSION: ::c_int = 121;
 
+pub const PTHREAD_PROCESS_PRIVATE: usize = 2;
+pub const PTHREAD_PROCESS_SHARED: usize = 1;
 pub const PTHREAD_CREATE_JOINABLE: ::c_int = 1;
 pub const PTHREAD_CREATE_DETACHED: ::c_int = 2;
 pub const PTHREAD_STACK_MIN: ::size_t = 8192;
@@ -1603,6 +1610,10 @@ extern {
                                         pshared: ::c_int) -> ::c_int;
     pub fn pthread_mutexattr_getpshared(attr: *const pthread_mutexattr_t,
                                         pshared: *mut ::c_int) -> ::c_int;
+    pub fn pthread_rwlockattr_getpshared(attr: *const pthread_rwlockattr_t,
+                                         val: *mut ::c_int) -> ::c_int;
+    pub fn pthread_rwlockattr_setpshared(attr: *mut pthread_rwlockattr_t,
+                                         val: ::c_int) -> ::c_int;
     pub fn __error() -> *mut ::c_int;
     pub fn backtrace(buf: *mut *mut ::c_void,
                      sz: ::c_int) -> ::c_int;

src/unix/bsd/freebsdlike/mod.rs

@@ -7,6 +7,7 @@ pub type pthread_mutexattr_t = *mut ::c_void;
 pub type pthread_cond_t = *mut ::c_void;
 pub type pthread_condattr_t = *mut ::c_void;
 pub type pthread_rwlock_t = *mut ::c_void;
+pub type pthread_rwlockattr_t = *mut ::c_void;
 pub type pthread_key_t = ::c_int;
 pub type tcflag_t = ::c_uint;
 pub type speed_t = ::c_uint;
@@ -466,6 +467,8 @@ pub const POSIX_MADV_SEQUENTIAL: ::c_int = 2;
 pub const POSIX_MADV_WILLNEED: ::c_int = 3;
 pub const POSIX_MADV_DONTNEED: ::c_int = 4;
 
+pub const PTHREAD_PROCESS_PRIVATE: ::c_int = 0;
+pub const PTHREAD_PROCESS_SHARED: ::c_int = 1;
 pub const PTHREAD_CREATE_JOINABLE: ::c_int = 0;
 pub const PTHREAD_CREATE_DETACHED: ::c_int = 1;
 
@@ -1059,6 +1062,10 @@ extern {
                                         pshared: ::c_int) -> ::c_int;
     pub fn pthread_mutexattr_getpshared(attr: *const pthread_mutexattr_t,
                                         pshared: *mut ::c_int) -> ::c_int;
+    pub fn pthread_rwlockattr_getpshared(attr: *const pthread_rwlockattr_t,
+                                         val: *mut ::c_int) -> ::c_int;
+    pub fn pthread_rwlockattr_setpshared(attr: *mut pthread_rwlockattr_t,
+                                         val: ::c_int) -> ::c_int;
     pub fn getpriority(which: ::c_int, who: ::c_int) -> ::c_int;
     pub fn setpriority(which: ::c_int, who: ::c_int, prio: ::c_int) -> ::c_int;
 

src/unix/bsd/netbsdlike/netbsd/mod.rs

@@ -165,6 +165,11 @@ s! {
         ptma_private: *mut ::c_void,
     }
 
+    pub struct pthread_rwlockattr_t {
+        ptra_magic: ::c_uint,
+        ptra_private: *mut ::c_void,
+    }
+
     pub struct pthread_cond_t {
         ptc_magic: ::c_uint,
         ptc_lock: ::c_uchar,

src/unix/bsd/netbsdlike/openbsdlike/mod.rs

@@ -13,6 +13,7 @@ pub type pthread_mutexattr_t = *mut ::c_void;
 pub type pthread_cond_t = *mut ::c_void;
 pub type pthread_condattr_t = *mut ::c_void;
 pub type pthread_rwlock_t = *mut ::c_void;
+pub type pthread_rwlockattr_t = *mut ::c_void;
 
 s! {
     pub struct dirent {

src/unix/haiku/mod.rs

@@ -23,6 +23,7 @@ pub type useconds_t = u32;
 pub type socklen_t = u32;
 pub type pthread_t = ::uintptr_t;
 pub type pthread_mutexattr_t = ::uintptr_t;
+pub type pthread_rwlockattr_t = ::uintptr_t;
 pub type sigset_t = u64;
 pub type fsblkcnt_t = i64;
 pub type fsfilcnt_t = i64;

src/unix/mod.rs

@@ -647,6 +647,10 @@ extern {
     pub fn pthread_cond_destroy(cond: *mut pthread_cond_t) -> ::c_int;
     pub fn pthread_condattr_init(attr: *mut pthread_condattr_t) -> ::c_int;
     pub fn pthread_condattr_destroy(attr: *mut pthread_condattr_t) -> ::c_int;
+    #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
+               link_name = "pthread_rwlock_init$UNIX2003")]
+    pub fn pthread_rwlock_init(lock: *mut pthread_rwlock_t,
+                               attr: *const pthread_rwlockattr_t) -> ::c_int;
     #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                link_name = "pthread_rwlock_destroy$UNIX2003")]
     pub fn pthread_rwlock_destroy(lock: *mut pthread_rwlock_t) -> ::c_int;
@@ -665,6 +669,9 @@ extern {
     #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                link_name = "pthread_rwlock_unlock$UNIX2003")]
     pub fn pthread_rwlock_unlock(lock: *mut pthread_rwlock_t) -> ::c_int;
+    pub fn pthread_rwlockattr_init(attr: *mut pthread_rwlockattr_t) -> ::c_int;
+    pub fn pthread_rwlockattr_destroy(attr: *mut pthread_rwlockattr_t)
+                                      -> ::c_int;
     #[cfg_attr(all(target_os = "macos", target_arch = "x86"),
                link_name = "pthread_sigmask$UNIX2003")]
     pub fn pthread_sigmask(how: ::c_int, set: *const sigset_t,

src/unix/notbsd/android/mod.rs

@@ -12,6 +12,7 @@ pub type nlink_t = u32;
 pub type useconds_t = u32;
 pub type pthread_t = ::c_long;
 pub type pthread_mutexattr_t = ::c_long;
+pub type pthread_rwlockattr_t = ::c_long;
 pub type pthread_condattr_t = ::c_long;
 pub type fsfilcnt_t = ::c_ulong;
 pub type fsblkcnt_t = ::c_ulong;

src/unix/notbsd/linux/mips/mips32.rs

@@ -229,6 +229,7 @@ pub const __SIZEOF_PTHREAD_CONDATTR_T: usize = 4;
 pub const __SIZEOF_PTHREAD_MUTEX_T: usize = 24;
 pub const __SIZEOF_PTHREAD_RWLOCK_T: usize = 32;
 pub const __SIZEOF_PTHREAD_MUTEXATTR_T: usize = 4;
+pub const __SIZEOF_PTHREAD_RWLOCKATTR_T: usize = 8;
 
 pub const RLIM_INFINITY: ::rlim_t = 0x7fffffff;
 

src/unix/notbsd/linux/mips/mips64.rs

@@ -215,6 +215,7 @@ pub const __SIZEOF_PTHREAD_CONDATTR_T: usize = 4;
 pub const __SIZEOF_PTHREAD_MUTEXATTR_T: usize = 4;
 pub const __SIZEOF_PTHREAD_MUTEX_T: usize = 40;
 pub const __SIZEOF_PTHREAD_RWLOCK_T: usize = 56;
+pub const __SIZEOF_PTHREAD_RWLOCKATTR_T: usize = 8;
 
 pub const RLIM_INFINITY: ::rlim_t = 0xffff_ffff_ffff_ffff;
 

src/unix/notbsd/linux/mod.rs

@@ -104,6 +104,14 @@ s! {
         size: [u8; __SIZEOF_PTHREAD_MUTEXATTR_T],
     }
 
+    pub struct pthread_rwlockattr_t {
+        #[cfg(any(target_env = "musl"))]
+        __align: [::c_int; 0],
+        #[cfg(not(any(target_env = "musl")))]
+        __align: [::c_long; 0],
+        size: [u8; __SIZEOF_PTHREAD_RWLOCKATTR_T],
+    }
+
     pub struct pthread_cond_t {
         #[cfg(any(target_env = "musl"))]
         __align: [*const ::c_void; 0],
@@ -647,6 +655,8 @@ pub const PTHREAD_MUTEX_NORMAL: ::c_int = 0;
 pub const PTHREAD_MUTEX_RECURSIVE: ::c_int = 1;
 pub const PTHREAD_MUTEX_ERRORCHECK: ::c_int = 2;
 pub const PTHREAD_MUTEX_DEFAULT: ::c_int = PTHREAD_MUTEX_NORMAL;
+pub const PTHREAD_PROCESS_PRIVATE: usize = 0;
+pub const PTHREAD_PROCESS_SHARED: usize = 1;
 pub const __SIZEOF_PTHREAD_COND_T: usize = 48;
 
 pub const SCHED_OTHER: ::c_int = 0;

src/unix/notbsd/linux/musl/mod.rs

@@ -160,6 +160,7 @@ pub const FALLOC_FL_PUNCH_HOLE: ::c_int = 0x02;
 
 pub const __SIZEOF_PTHREAD_CONDATTR_T: usize = 4;
 pub const __SIZEOF_PTHREAD_MUTEXATTR_T: usize = 4;
+pub const __SIZEOF_PTHREAD_RWLOCKATTR_T: usize = 8;
 
 pub const CPU_SETSIZE: ::c_int = 128;
 

src/unix/notbsd/linux/other/b32/mod.rs

@@ -263,6 +263,7 @@ pub const __SIZEOF_PTHREAD_CONDATTR_T: usize = 4;
 pub const __SIZEOF_PTHREAD_MUTEX_T: usize = 24;
 pub const __SIZEOF_PTHREAD_RWLOCK_T: usize = 32;
 pub const __SIZEOF_PTHREAD_MUTEXATTR_T: usize = 4;
+pub const __SIZEOF_PTHREAD_RWLOCKATTR_T: usize = 8;
 
 pub const PTRACE_GETFPREGS: ::c_uint = 14;
 pub const PTRACE_SETFPREGS: ::c_uint = 15;

src/unix/notbsd/linux/other/b64/mod.rs

@@ -47,6 +47,7 @@ s! {
 }
 
 pub const __SIZEOF_PTHREAD_RWLOCK_T: usize = 56;
+pub const __SIZEOF_PTHREAD_RWLOCKATTR_T: usize = 8;
 
 cfg_if! {
     if #[cfg(target_arch = "aarch64")] {

src/unix/notbsd/linux/other/mod.rs

@@ -576,6 +576,10 @@ extern {
     pub fn pthread_setaffinity_np(thread: ::pthread_t,
                                   cpusetsize: ::size_t,
                                   cpuset: *const ::cpu_set_t) -> ::c_int;
+    pub fn pthread_rwlockattr_getkind_np(attr: *const ::pthread_rwlockattr_t,
+                                         val: *mut ::c_int) -> ::c_int;
+    pub fn pthread_rwlockattr_setkind_np(attr: *mut ::pthread_rwlockattr_t,
+                                         val: ::c_int) -> ::c_int;
     pub fn sched_getcpu() -> ::c_int;
 }
 

src/unix/notbsd/linux/s390x.rs

@@ -314,6 +314,7 @@ pub const __SIZEOF_PTHREAD_CONDATTR_T: usize = 4;
 pub const __SIZEOF_PTHREAD_MUTEXATTR_T: usize = 4;
 pub const __SIZEOF_PTHREAD_MUTEX_T: usize = 40;
 pub const __SIZEOF_PTHREAD_RWLOCK_T: usize = 56;
+pub const __SIZEOF_PTHREAD_RWLOCKATTR_T: usize = 8;
 
 pub const EADDRINUSE: ::c_int = 98;
 pub const EADDRNOTAVAIL: ::c_int = 99;

src/unix/notbsd/mod.rs

@@ -992,6 +992,10 @@ extern {
                                         pshared: ::c_int) -> ::c_int;
     pub fn pthread_mutexattr_getpshared(attr: *const pthread_mutexattr_t,
                                         pshared: *mut ::c_int) -> ::c_int;
+    pub fn pthread_rwlockattr_getpshared(attr: *const pthread_rwlockattr_t,
+                                         val: *mut ::c_int) -> ::c_int;
+    pub fn pthread_rwlockattr_setpshared(attr: *mut pthread_rwlockattr_t,
+                                         val: ::c_int) -> ::c_int;
     pub fn ptsname_r(fd: ::c_int,
                      buf: *mut ::c_char,
                      buflen: ::size_t) -> ::c_int;

src/unix/solaris/mod.rs

@@ -169,6 +169,10 @@ s! {
         __pthread_rwlock_writercv: ::pthread_cond_t
     }
 
+    pub struct pthread_rwlockattr_t {
+        __pthread_rwlockattrp: *mut ::c_void,
+    }
+
     pub struct dirent {
         pub d_ino: ::ino_t,
         pub d_off: ::off_t,
@@ -769,7 +773,7 @@ pub const POSIX_MADV_DONTNEED: ::c_int = 4;
 pub const PTHREAD_CREATE_JOINABLE: ::c_int = 0;
 pub const PTHREAD_CREATE_DETACHED: ::c_int = 0x40;
 pub const PTHREAD_PROCESS_SHARED: ::c_int = 1;
-pub const PTHREAD_PROCESS_PRIVATE: u16 = 0;
+pub const PTHREAD_PROCESS_PRIVATE: ::c_int = 0;
 pub const PTHREAD_STACK_MIN: ::size_t = 4096;
 
 pub const SIGSTKSZ: ::size_t = 8192;

src/unix/uclibc/mod.rs

@@ -257,6 +257,11 @@ s! {
         size: [u8; __SIZEOF_PTHREAD_MUTEXATTR_T],
     }
 
+    pub struct pthread_rwlockattr_t {
+        __lockkind: ::c_int,
+        __pshared: ::c_int,
+    }
+
     pub struct pthread_cond_t {
         __align: [::c_longlong; 0],
         size: [u8; __SIZEOF_PTHREAD_COND_T],
@@ -1577,6 +1582,14 @@ extern {
                                         pshared: ::c_int) -> ::c_int;
     pub fn pthread_mutexattr_getpshared(attr: *const pthread_mutexattr_t,
                                         pshared: *mut ::c_int) -> ::c_int;
+    pub fn pthread_rwlockattr_getkind_np(attr: *const pthread_rwlockattr_t,
+                                         val: *mut ::c_int) -> ::c_int;
+    pub fn pthread_rwlockattr_setkind_np(attr: *mut pthread_rwlockattr_t,
+                                         val: ::c_int) -> ::c_int;
+    pub fn pthread_rwlockattr_getpshared(attr: *const pthread_rwlockattr_t,
+                                         val: *mut ::c_int) -> ::c_int;
+    pub fn pthread_rwlockattr_setpshared(attr: *mut pthread_rwlockattr_t,
+                                         val: ::c_int) -> ::c_int;
     pub fn ptsname_r(fd: ::c_int,
                      buf: *mut ::c_char,
                      buflen: ::size_t) -> ::c_int;