diff --git a/lib/std/os/bits/openbsd.zig b/lib/std/os/bits/openbsd.zig
index d265c68b42..24b4a5add3 100644
--- a/lib/std/os/bits/openbsd.zig
+++ b/lib/std/os/bits/openbsd.zig
@@ -32,6 +32,24 @@ pub const Kevent = extern struct {
     udata: usize,
 };
 
+// Modes and flags for dlopen()
+// include/dlfcn.h
+
+/// Bind function calls lazily.
+pub const RTLD_LAZY = 1;
+
+/// Bind function calls immediately.
+pub const RTLD_NOW = 2;
+
+/// Make symbols globally available.
+pub const RTLD_GLOBAL = 0x100;
+
+/// Opposite of RTLD_GLOBAL, and the default.
+pub const RTLD_LOCAL = 0x000;
+
+/// Trace loaded objects and exit.
+pub const RTLD_TRACE = 0x200;
+
 pub const dl_phdr_info = extern struct {
     dlpi_addr: std.elf.Addr,
     dlpi_name: ?[*:0]const u8,
@@ -185,7 +203,17 @@ pub const libc_stat = extern struct {
 
 pub const timespec = extern struct {
     tv_sec: time_t,
-    tv_nsec: isize,
+    tv_nsec: c_long,
+};
+
+pub const timeval = extern struct {
+    tv_sec: time_t,
+    tv_usec: c_long,
+};
+
+pub const timezone = extern struct {
+    tz_minuteswest: c_int,
+    tz_dsttime: c_int,
 };
 
 pub const MAXNAMLEN = 255;
@@ -264,10 +292,13 @@ pub const AI_ADDRCONFIG = 64;
 
 pub const CTL_KERN = 1;
 pub const CTL_DEBUG = 5;
+pub const CTL_HW = 6;
 
 pub const KERN_PROC_ARGS = 55;
 pub const KERN_PROC_ARGV = 1;
 
+pub const HW_NCPUONLINE = 25;
+
 pub const PATH_MAX = 1024;
 
 pub const STDIN_FILENO = 0;
@@ -450,6 +481,36 @@ pub const SOCK_SEQPACKET = 5;
 pub const SOCK_CLOEXEC = 0x8000;
 pub const SOCK_NONBLOCK = 0x4000;
 
+pub const SO_DEBUG = 0x0001;
+pub const SO_ACCEPTCONN = 0x0002;
+pub const SO_REUSEADDR = 0x0004;
+pub const SO_KEEPALIVE = 0x0008;
+pub const SO_DONTROUTE = 0x0010;
+pub const SO_BROADCAST = 0x0020;
+pub const SO_USELOOPBACK = 0x0040;
+pub const SO_LINGER = 0x0080;
+pub const SO_OOBINLINE = 0x0100;
+pub const SO_REUSEPORT = 0x0200;
+pub const SO_TIMESTAMP = 0x0800;
+pub const SO_BINDANY = 0x1000;
+pub const SO_ZEROIZE = 0x2000;
+pub const SO_SNDBUF = 0x1001;
+pub const SO_RCVBUF = 0x1002;
+pub const SO_SNDLOWAT = 0x1003;
+pub const SO_RCVLOWAT = 0x1004;
+pub const SO_SNDTIMEO = 0x1005;
+pub const SO_RCVTIMEO = 0x1006;
+pub const SO_ERROR = 0x1007;
+pub const SO_TYPE = 0x1008;
+pub const SO_NETPROC = 0x1020;
+pub const SO_RTABLE = 0x1021;
+pub const SO_PEERCRED = 0x1022;
+pub const SO_SPLICE = 0x1023;
+pub const SO_DOMAIN = 0x1024;
+pub const SO_PROTOCOL = 0x1025;
+
+pub const SOL_SOCKET = 0xffff;
+
 pub const PF_UNSPEC = AF_UNSPEC;
 pub const PF_LOCAL = AF_LOCAL;
 pub const PF_UNIX = AF_UNIX;
diff --git a/lib/std/reset_event.zig b/lib/std/reset_event.zig
index a53af100db..344df200f5 100644
--- a/lib/std/reset_event.zig
+++ b/lib/std/reset_event.zig
@@ -109,9 +109,12 @@ const PosixEvent = struct {
     }
 
     fn deinit(self: *PosixEvent) void {
-        // on dragonfly, *destroy() functions can return EINVAL
+        // on dragonfly or openbsd, *destroy() functions can return EINVAL
         // for statically initialized pthread structures
-        const err = if (builtin.os.tag == .dragonfly) os.EINVAL else 0;
+        const err = if (builtin.os.tag == .dragonfly or builtin.os.tag == .openbsd)
+            os.EINVAL
+        else
+            0;
 
         const retm = c.pthread_mutex_destroy(&self.mutex);
         assert(retm == 0 or retm == err);
@@ -447,7 +450,7 @@ test "ResetEvent" {
         fn timedWaiter(self: *Self) !void {
             self.in.wait();
             testing.expectError(error.TimedOut, self.out.timedWait(time.ns_per_us));
-            try self.out.timedWait(time.ns_per_ms * 10);
+            try self.out.timedWait(time.ns_per_ms * 100);
             testing.expect(self.value == 5);
         }
     };
diff --git a/lib/std/thread.zig b/lib/std/thread.zig
index 330c425dd6..b45a37ca1b 100644
--- a/lib/std/thread.zig
+++ b/lib/std/thread.zig
@@ -491,6 +491,16 @@ pub const Thread = struct {
         if (std.Target.current.os.tag == .windows) {
             return os.windows.peb().NumberOfProcessors;
         }
+        if (std.Target.current.os.tag == .openbsd) {
+            var count: c_int = undefined;
+            var count_size: usize = @sizeOf(c_int);
+            const mib = [_]c_int{ os.CTL_HW, os.HW_NCPUONLINE };
+            os.sysctl(&mib, &count, &count_size, null, 0) catch |err| switch (err) {
+                error.NameTooLong, error.UnknownName => unreachable,
+                else => |e| return e,
+            };
+            return @intCast(usize, count);
+        }
         var count: c_int = undefined;
         var count_len: usize = @sizeOf(c_int);
         const name = if (comptime std.Target.current.isDarwin()) "hw.logicalcpu" else "hw.ncpu";