Auto merge of #3347 - 4lDO2:redox_pthreads, r=JohnTitor

Redox pthreads

This updates the pthread typedefs and sigset_t, following the [relatively recent Redox pthreads rewrite](https://gitlab.redox-os.org/redox-os/relibc/-/merge_requests/380).

Author: bors

src/unix/redox/mod.rs

@@ -28,20 +28,13 @@ pub type nfds_t = ::c_ulong;
 pub type nlink_t = ::c_ulong;
 pub type off_t = ::c_longlong;
 pub type pthread_t = *mut ::c_void;
-pub type pthread_attr_t = *mut ::c_void;
-pub type pthread_cond_t = *mut ::c_void;
-pub type pthread_condattr_t = *mut ::c_void;
 // Must be usize due to libstd/sys_common/thread_local.rs,
 // should technically be *mut ::c_void
 pub type pthread_key_t = usize;
-pub type pthread_mutex_t = *mut ::c_void;
-pub type pthread_mutexattr_t = *mut ::c_void;
-pub type pthread_rwlock_t = *mut ::c_void;
-pub type pthread_rwlockattr_t = *mut ::c_void;
 pub type rlim_t = ::c_ulonglong;
 pub type sa_family_t = u16;
 pub type sem_t = *mut ::c_void;
-pub type sigset_t = ::c_ulong;
+pub type sigset_t = ::c_ulonglong;
 pub type socklen_t = u32;
 pub type speed_t = u32;
 pub type suseconds_t = ::c_int;
@@ -265,7 +258,74 @@ s! {
         pub uid: uid_t,
         pub gid: gid_t,
     }
+
+    #[cfg_attr(target_pointer_width = "32", repr(C, align(4)))]
+    #[cfg_attr(target_pointer_width = "64", repr(C, align(8)))]
+    pub struct pthread_attr_t {
+        bytes: [u8; _PTHREAD_ATTR_SIZE],
+    }
+    #[repr(C)]
+    #[repr(align(4))]
+    pub struct pthread_barrier_t {
+        bytes: [u8; _PTHREAD_BARRIER_SIZE],
+    }
+    #[repr(C)]
+    #[repr(align(4))]
+    pub struct pthread_barrierattr_t {
+        bytes: [u8; _PTHREAD_BARRIERATTR_SIZE],
+    }
+    #[repr(C)]
+    #[repr(align(4))]
+    pub struct pthread_mutex_t {
+        bytes: [u8; _PTHREAD_MUTEX_SIZE],
+    }
+    #[repr(C)]
+    #[repr(align(4))]
+    pub struct pthread_rwlock_t {
+        bytes: [u8; _PTHREAD_RWLOCK_SIZE],
+    }
+    #[repr(C)]
+    #[repr(align(4))]
+    pub struct pthread_mutexattr_t {
+        bytes: [u8; _PTHREAD_MUTEXATTR_SIZE],
+    }
+    #[repr(C)]
+    #[repr(align(1))]
+    pub struct pthread_rwlockattr_t {
+        bytes: [u8; _PTHREAD_RWLOCKATTR_SIZE],
+    }
+    #[repr(C)]
+    #[repr(align(4))]
+    pub struct pthread_cond_t {
+        bytes: [u8; _PTHREAD_COND_SIZE],
+    }
+    #[repr(C)]
+    #[repr(align(4))]
+    pub struct pthread_condattr_t {
+        bytes: [u8; _PTHREAD_CONDATTR_SIZE],
+    }
+    #[repr(C)]
+    #[repr(align(4))]
+    pub struct pthread_once_t {
+        bytes: [u8; _PTHREAD_ONCE_SIZE],
+    }
+    #[repr(C)]
+    #[repr(align(4))]
+    pub struct pthread_spinlock_t {
+        bytes: [u8; _PTHREAD_SPINLOCK_SIZE],
+    }
 }
+const _PTHREAD_ATTR_SIZE: usize = 32;
+const _PTHREAD_RWLOCKATTR_SIZE: usize = 1;
+const _PTHREAD_RWLOCK_SIZE: usize = 4;
+const _PTHREAD_BARRIER_SIZE: usize = 24;
+const _PTHREAD_BARRIERATTR_SIZE: usize = 4;
+const _PTHREAD_CONDATTR_SIZE: usize = 8;
+const _PTHREAD_COND_SIZE: usize = 8;
+const _PTHREAD_MUTEX_SIZE: usize = 12;
+const _PTHREAD_MUTEXATTR_SIZE: usize = 20;
+const _PTHREAD_ONCE_SIZE: usize = 4;
+const _PTHREAD_SPINLOCK_SIZE: usize = 4;
 
 pub const UTSLENGTH: usize = 65;
 
@@ -549,9 +609,15 @@ pub const POLLWRBAND: ::c_short = 0x200;
 // pthread.h
 pub const PTHREAD_MUTEX_NORMAL: ::c_int = 0;
 pub const PTHREAD_MUTEX_RECURSIVE: ::c_int = 1;
-pub const PTHREAD_MUTEX_INITIALIZER: ::pthread_mutex_t = -1isize as *mut _;
-pub const PTHREAD_COND_INITIALIZER: ::pthread_cond_t = -1isize as *mut _;
-pub const PTHREAD_RWLOCK_INITIALIZER: ::pthread_rwlock_t = -1isize as *mut _;
+pub const PTHREAD_MUTEX_INITIALIZER: ::pthread_mutex_t = ::pthread_mutex_t {
+    bytes: [0; _PTHREAD_MUTEX_SIZE],
+};
+pub const PTHREAD_COND_INITIALIZER: ::pthread_cond_t = ::pthread_cond_t {
+    bytes: [0; _PTHREAD_COND_SIZE],
+};
+pub const PTHREAD_RWLOCK_INITIALIZER: ::pthread_rwlock_t = ::pthread_rwlock_t {
+    bytes: [0; _PTHREAD_RWLOCK_SIZE],
+};
 pub const PTHREAD_STACK_MIN: ::size_t = 4096;
 
 // signal.h