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+/*
+ * Copyright (c) 2019 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#ifndef __LIBPTHREAD_PROTOTYPES_INTERNAL_H__
+#define __LIBPTHREAD_PROTOTYPES_INTERNAL_H__
+
+/*!
+ * @file prototypes_internal.h
+ *
+ * @brief
+ * This file has prototypes for symbols / functions private to libpthread.
+ */
+
+#define PTHREAD_NOEXPORT __attribute__((visibility("hidden")))
+#define PTHREAD_NOEXPORT_VARIANT
+
+
+#pragma GCC visibility push(hidden)
+
+/*!
+ * @macro main_thread()
+ *
+ * @brief
+ * Returns a pointer to the main thread.
+ *
+ * @discussion
+ * The main thread structure really lives in dyld,
+ * and when __pthread_init() is called, its pointer will be discovered
+ * and stashed in _main_thread_ptr which libpthread uses.
+ */
+#if VARIANT_DYLD
+extern struct pthread_s _main_thread;
+#define main_thread() (&_main_thread)
+#define __pthread_mutex_default_opt_policy _PTHREAD_MTX_OPT_POLICY_DEFAULT
+#define __pthread_mutex_use_ulock _PTHREAD_MTX_OPT_ULOCK_DEFAULT
+#define __pthread_mutex_ulock_adaptive_spin _PTHREAD_MTX_OPT_ADAPTIVE_DEFAULT
+#else // VARIANT_DYLD
+extern pthread_t _main_thread_ptr;
+#define main_thread() (_main_thread_ptr)
+extern void *(*_pthread_malloc)(size_t);
+extern void (*_pthread_free)(void *);
+extern int __pthread_mutex_default_opt_policy;
+extern bool __pthread_mutex_use_ulock;
+extern bool __pthread_mutex_ulock_adaptive_spin;
+#endif // VARIANT_DYLD
+
+extern struct __pthread_list __pthread_head; // List of all pthreads in the process.
+extern _pthread_lock _pthread_list_lock;     // Lock protects access to above list.
+extern uint32_t _main_qos;
+extern uintptr_t _pthread_ptr_munge_token;
+
+#if PTHREAD_DEBUG_LOG
+#include <mach/mach_time.h>
+extern int _pthread_debuglog;
+extern uint64_t _pthread_debugstart;
+#endif
+
+/* pthread.c */
+void _pthread_deallocate(pthread_t t, bool from_mach_thread);
+void _pthread_main_thread_init(pthread_t p);
+void _pthread_main_thread_postfork_init(pthread_t p);
+void _pthread_bsdthread_init(struct _pthread_registration_data *data);
+void *_pthread_atomic_xchg_ptr(void **p, void *v);
+uint32_t _pthread_atomic_xchg_uint32_relaxed(uint32_t *p, uint32_t v);
+
+/* pthread_cancelable.c */
+void _pthread_markcancel_if_canceled(pthread_t thread, mach_port_t kport);
+void _pthread_setcancelstate_exit(pthread_t self, void *value_ptr);
+semaphore_t _pthread_joiner_prepost_wake(pthread_t thread);
+int _pthread_join(pthread_t thread, void **value_ptr, pthread_conformance_t);
+
+/* pthread_cond.c */
+int _pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex,
+		const struct timespec *abstime, int isRelative, pthread_conformance_t);
+int _pthread_mutex_droplock(pthread_mutex_t *mutex, uint32_t *flagp,
+		uint32_t **pmtxp, uint32_t *mgenp, uint32_t *ugenp);
+
+/* pthread_dependency.c */
+void _pthread_dependency_fulfill_slow(pthread_dependency_t *pr, uint32_t old);
+
+/* pthread_mutex.c */
+OS_COLD OS_NORETURN
+int _pthread_mutex_corruption_abort(pthread_mutex_t *mutex);
+int _pthread_mutex_fairshare_lock_slow(pthread_mutex_t *mutex, bool trylock);
+int _pthread_mutex_fairshare_unlock_slow(pthread_mutex_t *mutex);
+int _pthread_mutex_ulock_lock(pthread_mutex_t *mutex, bool trylock);
+int _pthread_mutex_ulock_unlock(pthread_mutex_t *mutex);
+int _pthread_mutex_firstfit_lock_slow(pthread_mutex_t *mutex, bool trylock);
+int _pthread_mutex_firstfit_unlock_slow(pthread_mutex_t *mutex);
+int _pthread_mutex_lock_init_slow(pthread_mutex_t *mutex, bool trylock);
+void _pthread_mutex_global_init(const char *envp[], struct _pthread_registration_data *registration_data);
+
+/* pthread_rwlock.c */
+enum rwlock_seqfields;
+int _pthread_rwlock_lock_slow(pthread_rwlock_t *rwlock, bool readlock, bool trylock);
+int _pthread_rwlock_unlock_slow(pthread_rwlock_t *rwlock, enum rwlock_seqfields updated_seqfields);
+
+/* pthread_tsd.c */
+void _pthread_tsd_cleanup(pthread_t self);
+void _pthread_key_global_init(const char *envp[]);
+
+/* qos.c */
+thread_qos_t _pthread_qos_class_to_thread_qos(qos_class_t qos);
+void _pthread_set_main_qos(pthread_priority_t qos);
+
+#pragma GCC visibility pop
+
+#endif // __LIBPTHREAD_PROTOTYPES_INTERNAL_H__