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https://gitlab.freedesktop.org/pulseaudio/pulseaudio.git
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NetBSD specific atomic operation implementation
Signed-off-by: Lennart Poettering <lennart@poettering.net>
This commit is contained in:
Jared D. McNeill
Lennart Poettering
parent
cc425ed260
commit
8d89ccdcf2
2 changed files with 150 additions and 53 deletions
130
configure.ac
130
configure.ac
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@ -129,16 +129,31 @@ AC_ARG_ENABLE([atomic-arm-memory-barrier],
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esac
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],)
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AC_ARG_ENABLE([netbsd-atomic-ops],
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AS_HELP_STRING([--enable-netbsd-atomic-ops],[Use the native NetBSD atomic_ops implementation]),
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[
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case "${enableval}" in
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yes) atomic_netbsd_helpers=yes ;;
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no) atomic_netbsd_helpers=no ;;
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*) AC_MSG_ERROR(bad value ${enableval} for --enable-netbsd-atomic-ops) ;;
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esac
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],
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[atomic_netbsd_helpers=auto])
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AC_MSG_CHECKING([target operating system])
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case $host in
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*-*-linux*)
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AC_MSG_RESULT([linux])
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pulse_target_os=linux
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;;
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*)
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AC_MSG_RESULT([unknown])
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pulse_target_os=unknown
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;;
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*-*-linux*)
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AC_MSG_RESULT([linux])
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pulse_target_os=linux
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;;
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*-*-netbsd*)
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AC_MSG_RESULT([netbsd])
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pulse_target_os=netbsd
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;;
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*)
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AC_MSG_RESULT([unknown])
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pulse_target_os=unknown
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;;
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esac
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# If everything else fails use libatomic_ops
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@ -160,42 +175,48 @@ else
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AC_MSG_CHECKING([architecture for native atomic operations])
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case $host_cpu in
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arm*)
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AC_MSG_RESULT([arm])
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AC_MSG_CHECKING([whether we can use Linux kernel helpers])
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# The Linux kernel helper functions have been there since 2.6.16. However
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# compile time checking for kernel version in cross compile environment
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# (which is usually the case for arm cpu) is tricky (or impossible).
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if test "x$pulse_target_os" = "xlinux" && test "x$atomic_arm_linux_helpers" != "xno"; then
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AC_MSG_RESULT([yes])
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AC_DEFINE_UNQUOTED(ATOMIC_ARM_LINUX_HELPERS, 1, [special arm linux implementation])
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need_libatomic_ops=no
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else
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AC_MSG_RESULT([no])
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AC_CACHE_CHECK([compiler support for arm inline asm atomic operations],
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pulseaudio_cv_support_arm_atomic_ops,
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[AC_COMPILE_IFELSE(
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AC_LANG_PROGRAM([],
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[[volatile int a=0;
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int o=0, n=1, r;
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asm volatile ("ldrex %0, [%1]\n"
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"subs %0, %0, %2\n"
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"strexeq %0, %3, [%1]\n"
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: "=&r" (r)
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: "r" (&a), "Ir" (o), "r" (n)
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: "cc");
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AC_MSG_RESULT([arm])
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AC_MSG_CHECKING([whether we can use Linux kernel helpers])
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# The Linux kernel helper functions have been there since 2.6.16. However
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# compile time checking for kernel version in cross compile environment
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# (which is usually the case for arm cpu) is tricky (or impossible).
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if test "x$pulse_target_os" = "xlinux" && test "x$atomic_arm_linux_helpers" != "xno"; then
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AC_MSG_RESULT([yes])
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AC_DEFINE_UNQUOTED(ATOMIC_ARM_LINUX_HELPERS, 1, [special arm linux implementation])
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need_libatomic_ops=no
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else
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AC_MSG_RESULT([no])
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AC_CACHE_CHECK([compiler support for arm inline asm atomic operations],
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pulseaudio_cv_support_arm_atomic_ops,
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[AC_COMPILE_IFELSE(
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AC_LANG_PROGRAM([],
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[[volatile int a=0;
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int o=0, n=1, r;
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asm volatile ("ldrex %0, [%1]\n"
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"subs %0, %0, %2\n"
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"strexeq %0, %3, [%1]\n"
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: "=&r" (r)
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: "r" (&a), "Ir" (o), "r" (n)
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: "cc");
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return (a==1 ? 0 : -1);
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]]),
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[pulseaudio_cv_support_arm_atomic_ops=yes],
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[pulseaudio_cv_support_arm_atomic_ops=no])
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])
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AS_IF([test "$pulseaudio_cv_support_arm_atomic_ops" = "yes"], [
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AC_DEFINE([ATOMIC_ARM_INLINE_ASM], 1, [Have ARMv6 instructions.])
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need_libatomic_ops=no
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])
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fi
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;;
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]]),
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[pulseaudio_cv_support_arm_atomic_ops=yes],
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[pulseaudio_cv_support_arm_atomic_ops=no])
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])
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AS_IF([test "$pulseaudio_cv_support_arm_atomic_ops" = "yes"], [
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AC_DEFINE([ATOMIC_ARM_INLINE_ASM], 1, [Have ARMv6 instructions.])
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need_libatomic_ops=no
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])
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fi
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;;
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*)
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AC_MSG_RESULT([unknown])
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if test "x$pulse_target_os" = "xnetbsd" && test "x$atomic_netbsd_helpers" = "xyes"; then
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AC_MSG_RESULT([yes])
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AC_DEFINE_UNQUOTED(NETBSD_ATOMIC_OPS, 1, [netbsd implementation])
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need_libatomic_ops=no
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else
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AC_MSG_RESULT([unknown])
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fi
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;;
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esac
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fi
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@ -225,11 +246,11 @@ LTDL_INIT([convenience recursive])
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os_is_win32=0
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case "$host_os" in
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mingw*)
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mingw*)
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AC_DEFINE([OS_IS_WIN32], 1, [Build target is Windows.])
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os_is_win32=1
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;;
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esac
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;;
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esac
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AM_CONDITIONAL(OS_IS_WIN32, test "x$os_is_win32" = "x1")
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@ -248,14 +269,14 @@ AC_CHECK_HEADERS([arpa/inet.h glob.h grp.h netdb.h netinet/in.h \
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sys/mman.h sys/resource.h sys/select.h sys/socket.h sys/wait.h \
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sys/uio.h syslog.h sys/dl.h dlfcn.h linux/sockios.h])
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AC_CHECK_HEADERS([netinet/ip.h], [], [],
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[#include <sys/types.h>
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#if HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#if HAVE_NETINET_IN_SYSTM_H
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# include <netinet/in_systm.h>
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#endif
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])
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[#include <sys/types.h>
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#if HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#if HAVE_NETINET_IN_SYSTM_H
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# include <netinet/in_systm.h>
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#endif
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])
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AC_CHECK_HEADERS([regex.h], [HAVE_REGEX=1], [HAVE_REGEX=0])
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AC_CHECK_HEADERS([sys/un.h], [HAVE_AF_UNIX=1], [HAVE_AF_UNIX=0])
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@ -275,6 +296,9 @@ AC_CHECK_HEADERS([sys/filio.h])
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# Windows
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AC_CHECK_HEADERS([windows.h winsock2.h ws2tcpip.h])
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# NetBSD
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AC_CHECK_HEADERS([sys/atomic.h])
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# Other
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AC_CHECK_HEADERS([sys/ioctl.h])
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AC_CHECK_HEADERS([byteswap.h])
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@ -107,6 +107,79 @@ static inline pa_bool_t pa_atomic_ptr_cmpxchg(pa_atomic_ptr_t *a, void *old_p, v
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return __sync_bool_compare_and_swap(&a->value, (long) old_p, (long) new_p);
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}
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#elif defined(__NetBSD__) && defined(HAVE_SYS_ATOMIC_H)
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/* NetBSD 5.0+ atomic_ops(3) implementation */
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#include <sys/atomic.h>
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typedef struct pa_atomic {
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volatile unsigned int value;
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} pa_atomic_t;
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#define PA_ATOMIC_INIT(v) { .value = (unsigned int) (v) }
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static inline int pa_atomic_load(const pa_atomic_t *a) {
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membar_sync();
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return (int) a->value;
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}
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static inline void pa_atomic_store(pa_atomic_t *a, int i) {
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a->value = (unsigned int) i;
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membar_sync();
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}
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/* Returns the previously set value */
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static inline int pa_atomic_add(pa_atomic_t *a, int i) {
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int nv = (int) atomic_add_int_nv(&a->value, i);
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return nv - i;
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}
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/* Returns the previously set value */
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static inline int pa_atomic_sub(pa_atomic_t *a, int i) {
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int nv = (int) atomic_add_int_nv(&a->value, -i);
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return nv + i;
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}
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/* Returns the previously set value */
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static inline int pa_atomic_inc(pa_atomic_t *a) {
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int nv = (int) atomic_inc_uint_nv(&a->value);
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return nv - 1;
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}
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/* Returns the previously set value */
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static inline int pa_atomic_dec(pa_atomic_t *a) {
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int nv = (int) atomic_dec_uint_nv(&a->value);
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return nv + 1;
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}
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/* Returns TRUE when the operation was successful. */
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static inline pa_bool_t pa_atomic_cmpxchg(pa_atomic_t *a, int old_i, int new_i) {
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unsigned int r = atomic_cas_uint(&a->value, (unsigned int) old_i, (unsigned int) new_i);
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return (int) r == old_i;
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}
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typedef struct pa_atomic_ptr {
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volatile void *value;
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} pa_atomic_ptr_t;
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#define PA_ATOMIC_PTR_INIT(v) { .value = (v) }
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static inline void* pa_atomic_ptr_load(const pa_atomic_ptr_t *a) {
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membar_sync();
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return (void *) a->value;
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}
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static inline void pa_atomic_ptr_store(pa_atomic_ptr_t *a, void *p) {
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a->value = p;
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membar_sync();
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}
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static inline pa_bool_t pa_atomic_ptr_cmpxchg(pa_atomic_ptr_t *a, void *old_p, void* new_p) {
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void *r = atomic_cas_ptr(&a->value, old_p, new_p);
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return r == old_p;
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}
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#elif defined(__GNUC__) && (defined(__amd64__) || defined(__x86_64__))
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#warn "The native atomic operations implementation for AMD64 has not been tested thoroughly. libatomic_ops is known to not work properly on AMD64 and your gcc version is too old for the gcc-builtin atomic ops support. You have three options now: test the native atomic operations implementation for AMD64, fix libatomic_ops, or upgrade your GCC."
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