Prepare for radical source tree reorganization.zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 148 insertions, 0 deletions

diff --git a/REORG.TODO/nptl/pthread_mutex_init.c b/REORG.TODO/nptl/pthread_mutex_init.c
new file mode 100644
index 0000000000..138e144155
--- /dev/null
+++ b/REORG.TODO/nptl/pthread_mutex_init.c
@@ -0,0 +1,148 @@
+/* Copyright (C) 2002-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+   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
+   <http://www.gnu.org/licenses/>.  */
+
+#include <assert.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <string.h>
+#include <kernel-features.h>
+#include "pthreadP.h"
+#include <atomic.h>
+
+#include <stap-probe.h>
+
+static const struct pthread_mutexattr default_mutexattr =
+  {
+    /* Default is a normal mutex, not shared between processes.  */
+    .mutexkind = PTHREAD_MUTEX_NORMAL
+  };
+
+
+static bool
+prio_inherit_missing (void)
+{
+#ifdef __NR_futex
+  static int tpi_supported;
+  if (__glibc_unlikely (tpi_supported == 0))
+    {
+      int lock = 0;
+      INTERNAL_SYSCALL_DECL (err);
+      int ret = INTERNAL_SYSCALL (futex, err, 4, &lock, FUTEX_UNLOCK_PI, 0, 0);
+      assert (INTERNAL_SYSCALL_ERROR_P (ret, err));
+      tpi_supported = INTERNAL_SYSCALL_ERRNO (ret, err) == ENOSYS ? -1 : 1;
+    }
+  return __glibc_unlikely (tpi_supported < 0);
+#endif
+  return true;
+}
+
+int
+__pthread_mutex_init (pthread_mutex_t *mutex,
+		      const pthread_mutexattr_t *mutexattr)
+{
+  const struct pthread_mutexattr *imutexattr;
+
+  assert (sizeof (pthread_mutex_t) <= __SIZEOF_PTHREAD_MUTEX_T);
+
+  imutexattr = ((const struct pthread_mutexattr *) mutexattr
+		?: &default_mutexattr);
+
+  /* Sanity checks.  */
+  switch (__builtin_expect (imutexattr->mutexkind
+			    & PTHREAD_MUTEXATTR_PROTOCOL_MASK,
+			    PTHREAD_PRIO_NONE
+			    << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT))
+    {
+    case PTHREAD_PRIO_NONE << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT:
+      break;
+
+    case PTHREAD_PRIO_INHERIT << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT:
+      if (__glibc_unlikely (prio_inherit_missing ()))
+	return ENOTSUP;
+      break;
+
+    default:
+      /* XXX: For now we don't support robust priority protected mutexes.  */
+      if (imutexattr->mutexkind & PTHREAD_MUTEXATTR_FLAG_ROBUST)
+	return ENOTSUP;
+      break;
+    }
+
+  /* Clear the whole variable.  */
+  memset (mutex, '\0', __SIZEOF_PTHREAD_MUTEX_T);
+
+  /* Copy the values from the attribute.  */
+  mutex->__data.__kind = imutexattr->mutexkind & ~PTHREAD_MUTEXATTR_FLAG_BITS;
+
+  if ((imutexattr->mutexkind & PTHREAD_MUTEXATTR_FLAG_ROBUST) != 0)
+    {
+#ifndef __ASSUME_SET_ROBUST_LIST
+      if ((imutexattr->mutexkind & PTHREAD_MUTEXATTR_FLAG_PSHARED) != 0
+	  && __set_robust_list_avail < 0)
+	return ENOTSUP;
+#endif
+
+      mutex->__data.__kind |= PTHREAD_MUTEX_ROBUST_NORMAL_NP;
+    }
+
+  switch (imutexattr->mutexkind & PTHREAD_MUTEXATTR_PROTOCOL_MASK)
+    {
+    case PTHREAD_PRIO_INHERIT << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT:
+      mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_INHERIT_NP;
+      break;
+
+    case PTHREAD_PRIO_PROTECT << PTHREAD_MUTEXATTR_PROTOCOL_SHIFT:
+      mutex->__data.__kind |= PTHREAD_MUTEX_PRIO_PROTECT_NP;
+
+      int ceiling = (imutexattr->mutexkind
+		     & PTHREAD_MUTEXATTR_PRIO_CEILING_MASK)
+		    >> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT;
+      if (! ceiling)
+	{
+	  /* See __init_sched_fifo_prio.  */
+	  if (atomic_load_relaxed (&__sched_fifo_min_prio) == -1)
+	    __init_sched_fifo_prio ();
+	  if (ceiling < atomic_load_relaxed (&__sched_fifo_min_prio))
+	    ceiling = atomic_load_relaxed (&__sched_fifo_min_prio);
+	}
+      mutex->__data.__lock = ceiling << PTHREAD_MUTEX_PRIO_CEILING_SHIFT;
+      break;
+
+    default:
+      break;
+    }
+
+  /* The kernel when waking robust mutexes on exit never uses
+     FUTEX_PRIVATE_FLAG FUTEX_WAKE.  */
+  if ((imutexattr->mutexkind & (PTHREAD_MUTEXATTR_FLAG_PSHARED
+				| PTHREAD_MUTEXATTR_FLAG_ROBUST)) != 0)
+    mutex->__data.__kind |= PTHREAD_MUTEX_PSHARED_BIT;
+
+  /* Default values: mutex not used yet.  */
+  // mutex->__count = 0;	already done by memset
+  // mutex->__owner = 0;	already done by memset
+  // mutex->__nusers = 0;	already done by memset
+  // mutex->__spins = 0;	already done by memset
+  // mutex->__next = NULL;	already done by memset
+
+  LIBC_PROBE (mutex_init, 1, mutex);
+
+  return 0;
+}
+strong_alias (__pthread_mutex_init, pthread_mutex_init)
+hidden_def (__pthread_mutex_init)