Renamed lzma to xz and lzmadec to xzdec. We create symlinks

lzma, unlzma, and lzcat in "make install" for backwards
compatibility with LZMA Utils 4.32.x; I'm not sure if this
should be the default though.

1 files changed, 122 insertions, 0 deletions

diff --git a/src/xz/hardware.c b/src/xz/hardware.c
new file mode 100644
index 00000000..63bf0937
--- /dev/null
+++ b/src/xz/hardware.c
@@ -0,0 +1,122 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file       hardware.c
+/// \brief      Detection of available hardware resources
+//
+//  Copyright (C) 2007 Lasse Collin
+//
+//  This program 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.
+//
+//  This program 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.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "private.h"
+#include "physmem.h"
+
+
+/// Maximum number of free *coder* threads. This can be set with
+/// the --threads=NUM command line option.
+size_t opt_threads = 1;
+
+
+/// Memory usage limit for encoding
+static uint64_t memlimit_encoder;
+
+/// Memory usage limit for decoding
+static uint64_t memlimit_decoder;
+
+/// Memory usage limit given on the command line or environment variable.
+/// Zero indicates the default (memlimit_encoder or memlimit_decoder).
+static uint64_t memlimit_custom = 0;
+
+
+/// Get the number of CPU cores, and set opt_threads to default to that value.
+/// User can then override this with --threads command line option.
+static void
+hardware_cores(void)
+{
+#if defined(HAVE_NUM_PROCESSORS_SYSCONF)
+	const long cpus = sysconf(_SC_NPROCESSORS_ONLN);
+	if (cpus > 0)
+		opt_threads = (size_t)(cpus);
+
+#elif defined(HAVE_NUM_PROCESSORS_SYSCTL)
+	int name[2] = { CTL_HW, HW_NCPU };
+	int cpus;
+	size_t cpus_size = sizeof(cpus);
+	if (!sysctl(name, &cpus, &cpus_size, NULL, NULL)
+			&& cpus_size == sizeof(cpus) && cpus > 0)
+		opt_threads = (size_t)(cpus);
+#endif
+
+	// Limit opt_threads so that maximum number of threads doesn't exceed.
+
+#if defined(_SC_THREAD_THREADS_MAX)
+	const long threads_max = sysconf(_SC_THREAD_THREADS_MAX);
+	if (threads_max > 0 && (size_t)(threads_max) < opt_threads)
+		opt_threads = (size_t)(threads_max);
+
+#elif defined(PTHREAD_THREADS_MAX)
+	if (opt_threads > PTHREAD_THREADS_MAX)
+		opt_threads = PTHREAD_THREADS_MAX;
+#endif
+
+	return;
+}
+
+
+static void
+hardware_memlimit_init(void)
+{
+	uint64_t mem = physmem();
+
+	// If we cannot determine the amount of RAM, assume 32 MiB. Maybe
+	// even that is too much on some systems. But on most systems it's
+	// far too little, and can be annoying.
+	if (mem == 0)
+		mem = UINT64_C(16) * 1024 * 1024;
+
+	// Use at maximum of 90 % of RAM when encoding and 33 % when decoding.
+	memlimit_encoder = mem - mem / 10;
+	memlimit_decoder = mem / 3;
+
+	return;
+}
+
+
+extern void
+hardware_memlimit_set(uint64_t memlimit)
+{
+	memlimit_custom = memlimit;
+	return;
+}
+
+
+extern uint64_t
+hardware_memlimit_encoder(void)
+{
+	return memlimit_custom != 0 ? memlimit_custom : memlimit_encoder;
+}
+
+
+extern uint64_t
+hardware_memlimit_decoder(void)
+{
+	return memlimit_custom != 0 ? memlimit_custom : memlimit_decoder;
+}
+
+
+extern void
+hardware_init(void)
+{
+	hardware_memlimit_init();
+	hardware_cores();
+	return;
+}