golden hour

/usr/include

File/Folder	Size	Actions
FlexLexer.h	6.73 KB
GL	-
X11	-
a.out.h	4.25 KB
aio.h	7.56 KB
aliases.h	1.98 KB
alloca.h	1.17 KB
apache2	-
ar.h	1.69 KB
argp.h	24.95 KB
argz.h	5.91 KB
arpa	-
asm	-
asm-generic	-
assert.h	4.46 KB
autosprintf.h	2.36 KB
bind9	-
bits	-
blkid	-
brotli	-
bsock	-
byteswap.h	1.42 KB
bzlib.h	6.09 KB
c++	-
com_err.h	2.07 KB
complex.h	7.95 KB
cpio.h	2.21 KB
cpuidle.h	931 B
crypt.h	10.9 KB
ctype.h	10.71 KB
curses.h	96.82 KB
cursesapp.h	7.06 KB
cursesf.h	27.37 KB
cursesm.h	19.44 KB
cursesp.h	8.55 KB
cursesw.h	49.13 KB
cursslk.h	7.15 KB
db.h	120.22 KB
db_185.h	5.84 KB
dbm.h	1.37 KB
dirent.h	12.32 KB
dlfcn.h	7.52 KB
drm	-
e2p	-
elf.h	178.26 KB
endian.h	2.25 KB
entities.h	4.81 KB
envz.h	2.8 KB
err.h	2.29 KB
errno.h	1.64 KB
error.h	2.36 KB
et	-
eti.h	2.9 KB
etip.h	9.61 KB
evdns.h	1.97 KB
event.h	2.68 KB
event2	-
evhttp.h	1.99 KB
evrpc.h	1.97 KB
evutil.h	1.74 KB
execinfo.h	1.49 KB
expat.h	42.75 KB
expat_config.h	3.82 KB
expat_external.h	5.89 KB
ext2fs	-
fcntl.h	11.17 KB
features-time64.h	1.37 KB
features.h	17.69 KB
fenv.h	5.65 KB
ffi-x86_64.h	13.88 KB
ffi.h	556 B
ffitarget-x86_64.h	4.63 KB
ffitarget.h	616 B
finclude	-
fmtmsg.h	3.16 KB
fnmatch.h	2.24 KB
fontconfig	-
form.h	18.46 KB
fpu_control.h	3.5 KB
freetype2	-
fstab.h	3.04 KB
fstrm	-
fstrm.h	12.71 KB
fts.h	9.35 KB
ftw.h	6.19 KB
gconv.h	4.11 KB
gd.h	58.25 KB
gd_color_map.h	478 B
gd_errors.h	1.47 KB
gd_io.h	2.93 KB
gdbm	-
gdbm.h	11.9 KB
gdcache.h	2.92 KB
gdfontg.h	553 B
gdfontl.h	551 B
gdfontmb.h	519 B
gdfonts.h	515 B
gdfontt.h	546 B
gdfx.h	496 B
gdpp.h	50.73 KB
gelf.h	11.14 KB
getopt.h	1.43 KB
gettext-po.h	15.18 KB
gio-unix-2.0	-
glib-2.0	-
glob.h	7.13 KB
gnu	-
gnu-versions.h	2.29 KB
gnumake.h	2.84 KB
google	-
gpg-error.h	71.92 KB
gpgrt.h	71.92 KB
graphite2	-
grp.h	6.53 KB
gshadow.h	4.42 KB
gssapi	-
gssapi.h	181 B
gssrpc	-
harfbuzz	-
iconv.h	1.81 KB
idn-free.h	2.56 KB
idn-int.h	20 B
idna.h	3.89 KB
ieee754.h	4.8 KB
ifaddrs.h	2.77 KB
inttypes.h	8.14 KB
jconfig-64.h	1.98 KB
jconfig.h	246 B
jerror.h	15.35 KB
jmorecfg.h	13.98 KB
jpegint.h	15.25 KB
jpeglib.h	49.1 KB
json-c	-
kadm5	-
kdb.h	62.83 KB
keyutils.h	11.52 KB
krad.h	8.72 KB
krb5	-
krb5.h	402 B
langinfo.h	17.43 KB
lastlog.h	126 B
lber.h	15.12 KB
lber_types.h	1.43 KB
ldap.h	72.36 KB
ldap_cdefs.h	9.24 KB
ldap_features.h	1.55 KB
ldap_schema.h	9.23 KB
ldap_utf8.h	3.39 KB
ldif.h	4.68 KB
libaio.h	8.75 KB
libdb	-
libelf.h	19.84 KB
libexslt	-
libgen.h	1.35 KB
libintl.h	4.47 KB
liblsapi-sha1.h	569 B
libltdl	-
libmount	-
libpng16	-
libxml2	-
libxslt	-
limits.h	5.57 KB
link.h	7.05 KB
linux	-
lmdb.h	72.28 KB
locale.h	7.5 KB
lsapidef.h	4.6 KB
lscapi.h	24.21 KB
lscapi_config.h	599 B
ltdl.h	5.58 KB
lve	-
lzma	-
lzma.h	9.63 KB
malloc.h	5.77 KB
math.h	47.63 KB
maxminddb.h	8.34 KB
maxminddb_config-64.h	504 B
maxminddb_config.h	178 B
mcheck.h	2.38 KB
memory.h	956 B
menu.h	11.6 KB
misc	-
mntent.h	3.28 KB
monetary.h	1.92 KB
mqueue.h	4.5 KB
mtd	-
mysql	-
nc_tparm.h	4.67 KB
ncurses	-
ncurses.h	96.82 KB
ncurses_dll.h	3.95 KB
ncursesw	-
ndbm.h	2.39 KB
net	-
netash	-
netatalk	-
netax25	-
netdb.h	27.79 KB
neteconet	-
netinet	-
netipx	-
netiucv	-
netpacket	-
netrom	-
netrose	-
nfs	-
nl_types.h	1.71 KB
nlist.h	1.56 KB
nss.h	14.07 KB
obstack.h	20.81 KB
openldap.h	964 B
openssl	-
panel.h	4.41 KB
paths.h	2.91 KB
pcp	-
pcre.h	30.97 KB
pcre2.h	46.15 KB
pcre2posix.h	6.52 KB
pcre_scanner.h	6.45 KB
pcre_stringpiece.h	6.16 KB
pcrecpp.h	25.91 KB
pcrecpparg.h	6.62 KB
pcreposix.h	5.74 KB
png.h	139.51 KB
pngconf.h	22.31 KB
pnglibconf.h	7.43 KB
poll.h	22 B
powercap.h	1.62 KB
pr29.h	2.19 KB
printf.h	6.71 KB
proc_service.h	3.4 KB
profile.h	11.87 KB
protobuf-c	-
protocols	-
pthread.h	47.39 KB
pty.h	1.53 KB
punycode.h	9.3 KB
pwd.h	6.17 KB
python3.9	-
rdma	-
re_comp.h	963 B
readline	-
regex.h	25.3 KB
regexp.h	1.41 KB
resolv.h	12.1 KB
rpc	-
sasl	-
sched.h	4.92 KB
scsi	-
search.h	5.32 KB
security	-
selinux	-
semaphore.h	3.38 KB
sepol	-
setjmp.h	3.12 KB
sgtty.h	1.31 KB
shadow.h	5.34 KB
signal.h	12.73 KB
slapi-plugin.h	37.45 KB
sound	-
spawn.h	7.84 KB
stab.h	264 B
stdc-predef.h	2.24 KB
stdint.h	8.28 KB
stdio.h	30.67 KB
stdio_ext.h	2.73 KB
stdlib.h	35.46 KB
string.h	18.33 KB
stringprep.h	9.53 KB
strings.h	4.64 KB
sys	-
syscall.h	25 B
sysexits.h	5.11 KB
syslog.h	24 B
sysprof-4	-
tar.h	3.7 KB
term.h	40.95 KB
term_entry.h	8.9 KB
termcap.h	3.39 KB
termio.h	214 B
termios.h	3.51 KB
tgmath.h	39.24 KB
thread_db.h	15.65 KB
threads.h	7.51 KB
tic.h	14.48 KB
tiff.h	46.33 KB
tiffconf-64.h	3.19 KB
tiffconf.h	250 B
tiffio.h	24.13 KB
tiffio.hxx	1.62 KB
tiffvers.h	410 B
time.h	14.49 KB
tld.h	4.85 KB
ttyent.h	2.44 KB
uchar.h	1.96 KB
ucontext.h	1.99 KB
ulimit.h	1.55 KB
unctrl.h	3.1 KB
unicode	-
unistd.h	43.45 KB
utime.h	1.86 KB
utmp.h	3.15 KB
utmpx.h	4 KB
values.h	1.91 KB
verto-module.h	6.48 KB
verto.h	18.98 KB
video	-
wait.h	22 B
wchar.h	31.39 KB
wctype.h	5.42 KB
webp	-
wordexp.h	2.44 KB
xcb	-
xen	-
zconf.h	15.88 KB
zdict.h	25.81 KB
zlib.h	94 KB
zstd.h	167.36 KB
zstd_errors.h	4.43 KB

Edit: threads.h

/* ISO C11 Standard: 7.26 - Thread support library  <threads.h>.
   Copyright (C) 2018-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#ifndef _THREADS_H
#define _THREADS_H	1

#include <features.h>
#include <time.h>

__BEGIN_DECLS

#include <bits/thread-shared-types.h>
#include <bits/types/struct_timespec.h>

#ifndef __cplusplus
# define thread_local _Thread_local
#endif

#define TSS_DTOR_ITERATIONS 4
typedef __tss_t tss_t;
typedef void (*tss_dtor_t) (void*);

typedef __thrd_t thrd_t;
typedef int (*thrd_start_t) (void*);

/* Exit and error codes.  */
enum
{
  thrd_success  = 0,
  thrd_busy     = 1,
  thrd_error    = 2,
  thrd_nomem    = 3,
  thrd_timedout = 4
};

/* Mutex types.  */
enum
{
  mtx_plain     = 0,
  mtx_recursive = 1,
  mtx_timed     = 2
};

typedef __once_flag once_flag;
#define ONCE_FLAG_INIT __ONCE_FLAG_INIT

typedef union
{
  char __size[__SIZEOF_PTHREAD_MUTEX_T];
  long int __align __LOCK_ALIGNMENT;
} mtx_t;

typedef union
{
  char __size[__SIZEOF_PTHREAD_COND_T];
  __extension__ long long int __align __LOCK_ALIGNMENT;
} cnd_t;

/* Threads functions.  */

/* Create a new thread executing the function __FUNC.  Arguments for __FUNC
   are passed through __ARG.  If succesful, __THR is set to new thread
   identifier.  */
extern int thrd_create (thrd_t *__thr, thrd_start_t __func, void *__arg);

/* Check if __LHS and __RHS point to the same thread.  */
extern int thrd_equal (thrd_t __lhs, thrd_t __rhs);

/* Return current thread identifier.  */
extern thrd_t thrd_current (void);

/* Block current thread execution for at least the time pointed by
   __TIME_POINT.  The current thread may resume if receives a signal.  In
   that case, if __REMAINING is not NULL, the remaining time is stored in
   the object pointed by it.  */
#ifndef __USE_TIME_BITS64
extern int thrd_sleep (const struct timespec *__time_point,
		       struct timespec *__remaining);
#else
# ifdef __REDIRECT
extern int __REDIRECT (thrd_sleep, (const struct timespec *__time_point,
                                    struct timespec *__remaining),
                       __thrd_sleep64);
# else
#  define thrd_sleep __thrd_sleep64
# endif
#endif

/* Terminate current thread execution, cleaning up any thread local
   storage and freeing resources.  Returns the value specified in __RES.  */
extern void thrd_exit (int __res) __attribute__ ((__noreturn__));

/* Detach the thread identified by __THR from the current environment
   (it does not allow join or wait for it).  */
extern int thrd_detach (thrd_t __thr);

/* Block current thread until execution of __THR is complete.  In case that
   __RES is not NULL, will store the return value of __THR when exiting.  */
extern int thrd_join (thrd_t __thr, int *__res);

/* Stop current thread execution and call the scheduler to decide which
   thread should execute next.  The current thread may be selected by the
   scheduler to keep running.  */
extern void thrd_yield (void);

#ifdef __USE_EXTERN_INLINES
/* Optimizations.  */
__extern_inline int
thrd_equal (thrd_t __thread1, thrd_t __thread2)
{
  return __thread1 == __thread2;
}
#endif

/* Mutex functions.  */

/* Creates a new mutex object with type __TYPE.  If successful the new
   object is pointed by __MUTEX.  */
extern int mtx_init (mtx_t *__mutex, int __type);

/* Block the current thread until the mutex pointed to by __MUTEX is
   unlocked.  In that case current thread will not be blocked.  */
extern int mtx_lock (mtx_t *__mutex);

/* Block the current thread until the mutex pointed by __MUTEX is unlocked
   or time pointed by __TIME_POINT is reached.  In case the mutex is unlock,
   the current thread will not be blocked.  */
#ifndef __USE_TIME_BITS64
extern int mtx_timedlock (mtx_t *__restrict __mutex,
			  const struct timespec *__restrict __time_point);
#else
# ifdef __REDIRECT
extern int __REDIRECT (mtx_timedlock, (mtx_t *__restrict __mutex,
                                       const struct timespec *__restrict
                                       __time_point),
                       __mtx_timedlock64);
# else
#  define mtx_timedlock __mtx_timedlock64
# endif
#endif

/* Try to lock the mutex pointed by __MUTEX without blocking.  If the mutex
   is free the current threads takes control of it, otherwise it returns
   immediately.  */
extern int mtx_trylock (mtx_t *__mutex);

/* Unlock the mutex pointed by __MUTEX.  It may potentially awake other
   threads waiting on this mutex.  */
extern int mtx_unlock (mtx_t *__mutex);

/* Destroy the mutex object pointed by __MUTEX.  */
extern void mtx_destroy (mtx_t *__mutex);

/* Call function __FUNC exactly once, even if invoked from several threads.
   All calls must be made with the same __FLAGS object.  */
extern void call_once (once_flag *__flag, void (*__func)(void));

/* Condition variable functions.  */

/* Initialize new condition variable pointed by __COND.  */
extern int cnd_init (cnd_t *__cond);

/* Unblock one thread that currently waits on condition variable pointed
   by __COND.  */
extern int cnd_signal (cnd_t *__cond);

/* Unblock all threads currently waiting on condition variable pointed by
   __COND.  */
extern int cnd_broadcast (cnd_t *__cond);

/* Block current thread on the condition variable pointed by __COND.  */
extern int cnd_wait (cnd_t *__cond, mtx_t *__mutex);

/* Block current thread on the condition variable until condition variable
   pointed by __COND is signaled or time pointed by __TIME_POINT is
   reached.  */
#ifndef __USE_TIME_BITS64
extern int cnd_timedwait (cnd_t *__restrict __cond,
			  mtx_t *__restrict __mutex,
			  const struct timespec *__restrict __time_point);
#else
# ifdef __REDIRECT
extern int __REDIRECT (cnd_timedwait, (cnd_t *__restrict __cond,
                                       mtx_t *__restrict __mutex,
                                       const struct timespec *__restrict
                                       __time_point),
                       __cnd_timedwait64);
# else
#  define cnd_timedwait __cnd_timedwait64
# endif
#endif

/* Destroy condition variable pointed by __cond and free all of its
   resources.  */
extern void cnd_destroy (cnd_t *__COND);

/* Thread specific storage functions.  */

/* Create new thread-specific storage key and stores it in the object pointed
   by __TSS_ID.  If __DESTRUCTOR is not NULL, the function will be called when
   the thread terminates.  */
extern int tss_create (tss_t *__tss_id, tss_dtor_t __destructor);

/* Return the value held in thread-specific storage for the current thread
   identified by __TSS_ID.  */
extern void *tss_get (tss_t __tss_id);

/* Sets the value of the thread-specific storage identified by __TSS_ID for
   the current thread to __VAL.  */
extern int tss_set (tss_t __tss_id, void *__val);

/* Destroys the thread-specific storage identified by __TSS_ID.  The
   destructor is not called until thrd_exit is called.  */
extern void tss_delete (tss_t __tss_id);

__END_DECLS

#endif /* _THREADS_H */