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authorNicolas Schodet2015-06-03 13:46:44 +0200
committerNicolas Schodet2019-10-07 00:44:44 +0200
commit574480980dcffbfa7cd6dbe71e88253eb4c9feba (patch)
tree5f1c1261341a7c2a56de01d8c6d0815b164be8ba /ucoo/common.hh
parentd415a0646e874848cd06482c5d57916cca5cff4a (diff)
Rename ucoolib modules directory from ucoolib to ucoo
Diffstat (limited to 'ucoo/common.hh')
-rw-r--r--ucoo/common.hh91
1 files changed, 91 insertions, 0 deletions
diff --git a/ucoo/common.hh b/ucoo/common.hh
new file mode 100644
index 0000000..282041f
--- /dev/null
+++ b/ucoo/common.hh
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+#ifndef ucoo_common_hh
+#define ucoo_common_hh
+// ucoolib - Microcontroller object oriented library. {{{
+//
+// Copyright (C) 2012 Nicolas Schodet
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+//
+// }}}
+#include <stdint.h>
+
+#include "ucoo/arch/arch_common.hh"
+
+namespace ucoo {
+
+/// Integer which is read and written atomically.
+typedef int int_atomic_t;
+
+/// Compiler barrier. Prevents the compiler from moving the memory accesses
+/// from one side of it to the other side.
+extern inline void
+barrier ()
+{
+ __asm__ __volatile__("": : : "memory");
+}
+
+/// Ensure a single access is done, avoid compiler optimisations.
+template<typename T>
+extern inline volatile T &
+access_once (T &x)
+{
+ return *static_cast<volatile T *> (&x);
+}
+
+/// Stop, abruptly.
+void
+halt () __attribute__ ((noreturn));
+
+/// Stop, try to output error description corresponding to errno.
+void
+halt_perror () __attribute__ ((noreturn));
+
+/// To be used to swear that the given condition is true. If this is not the
+/// case... well... you swore!
+extern inline void
+assert (bool condition)
+{
+ if (!__builtin_expect (condition, 1))
+ halt ();
+}
+
+/// To be used to swear that this code can never be reached.
+void
+assert_unreachable () __attribute__ ((noreturn));
+extern inline void
+assert_unreachable ()
+{
+ halt ();
+}
+
+/// To be used to swear that the given condition is true, but print errno
+/// description anyway in case you lied.
+extern inline void
+assert_perror (bool condition)
+{
+ if (!__builtin_expect (condition, 1))
+ halt_perror ();
+}
+
+} // namespace ucoo
+
+/// Get array length at compile time, must be a macro until c++11.
+#define lengthof(array) (sizeof (array) / sizeof((array)[0]))
+
+#endif // ucoo_common_h