This is an RFC patch, I'd like to get some feedback if this is a preferred
way of doing it, or if I should seek other options (I really hate the ifdef
introduced earlier, and I know others do as well).
END INTRO
-H
Android: clean up the bypass ifdeffery
88af643971b9 (android: adjust target for android) introduced some really
ugly ifdefs to avoid calling into pthread_barrier_wait and
pthread_barrier_init.
This patch attempts to coalesce this into a single place and let the
compiler handle the linking so that cyclictest.c is untouched by evil
ifdefs.
Compiled and tested on:
- x86_64 (v3.13 kernel)
- tilegx (v3.10 kernel)
- arm64 android (v3.10 kernel)
Signed-off-by: Henrik Austad <haustad@xxxxxxxxx>
Cc: Clark Williams <williams@xxxxxxxxxx>
Cc: John Kacur <jkacur@xxxxxxxxxx>å
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
Makefile | 4 +---
include/bionic.h | 32 ++++++++++++++++++++++++++++++++
src/cyclictest/cyclictest.c | 25 +++----------------------
3 files changed, 36 insertions(+), 25 deletions(-)
create mode 100644 include/bionic.h
diff --git a/Makefile b/Makefile
index 351c349..1f5e561 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@ srcdir ?= $(prefix)/src
machinetype = $(shell $(CC) -dumpmachine | \
sed -e 's/-.*//' -e 's/i.86/i386/' -e 's/mips.*/mips/' -e 's/ppc.*/powerpc/')
-CFLAGS ?= -Wall -Wno-nonnull
+CFLAGS ?= -Wall -Wno-nonnull -Iinclude/
CPPFLAGS += -D_GNU_SOURCE -Isrc/include
LDFLAGS ?=
@@ -54,7 +54,6 @@ endif
# - pthread_[gs]etaffinity
#
# Typically see something like "aarch64-linux-android"
-
ifneq ($(shell $(CC) -dumpmachine | grep -i android),)
USE_BIONIC := 1
CFLAGS += -DNO_PTHREAD_BARRIER
@@ -70,7 +69,6 @@ ifneq ($(shell $(CC) -dumpmachine | grep -i android),)
# and link properly:
# - cyclictest
# - hackbench
-# - hwlatdetect
sources := cyclictest.c hackbench.c
TARGETS = $(sources:.c=)
endif
diff --git a/include/bionic.h b/include/bionic.h
new file mode 100644
index 0000000..5c46bec
--- /dev/null
+++ b/include/bionic.h
@@ -0,0 +1,32 @@
+#ifndef BIONIC_BYPASS_H
+#define BIONIC_BYPASS_H
+
+/* we do not have pthread barriers, add as small an emt */
+#ifdef NO_PTHREAD_BARRIER
+#warning Program is being compiled without PTHREAD_BARRIER support, some options may behave erratic.
+typedef int pthread_barrier_t;
+typedef int pthread_barrierattr_t;
+
+#ifndef PTHREAD_BARRIER_SERIAL_THREAD
+#define PTHREAD_BARRIER_SERIAL_THREAD 0
+#endif
+
+static inline int pthread_barrier_wait(pthread_barrier_t *barrier)
+{
+ return PTHREAD_BARRIER_SERIAL_THREAD;
+}
+
+static inline int pthread_barrier_destroy(pthread_barrier_t *barrier)
+{
+ return 0;
+}
+static inline int pthread_barrier_init(pthread_barrier_t * barrier,
+ const pthread_barrierattr_t * attr,
+ unsigned count)
+{
+ return 0;
+}
+
+#endif /* NO_PTHREAD_BARRIER */
+
+#endif /* BIONIC_BYPASS_H */
diff --git a/src/cyclictest/cyclictest.c b/src/cyclictest/cyclictest.c
index 96fa864..5167585 100644
--- a/src/cyclictest/cyclictest.c
+++ b/src/cyclictest/cyclictest.c
@@ -40,6 +40,8 @@
#include "rt-utils.h"
+#include <bionic.h>
+
#define DEFAULT_INTERVAL 1000
#define DEFAULT_DISTANCE 500
@@ -203,14 +205,12 @@ static pthread_mutex_t break_thread_id_lock = PTHREAD_MUTEX_INITIALIZER;
static pid_t break_thread_id = 0;
static uint64_t break_thread_value = 0;
-#ifndef NO_PTHREAD_BARRIER
static int aligned = 0;
static int secaligned = 0;
static int offset = 0;
static pthread_barrier_t align_barr;
static pthread_barrier_t globalt_barr;
static struct timespec globalt;
-#endif
/* Backup of kernel variables that we modify */
static struct kvars {
@@ -816,7 +816,6 @@ static void *timerthread(void *param)
fatal("timerthread%d: failed to set priority to %d\n", par->cpu, par->prio);
/* Get current time */
-#ifndef NO_PTHREAD_BARRIER
if(aligned || secaligned){
pthread_barrier_wait(&globalt_barr);
if (par->tnum == 0) {
@@ -842,7 +841,6 @@ static void *timerthread(void *param)
}
}
else
-#endif
clock_gettime(par->clock, &now);
next = now;
@@ -1049,9 +1047,7 @@ static void display_help(int error)
"-a [NUM] --affinity run thread #N on processor #N, if possible\n"
" with NUM pin all threads to the processor NUM\n"
#endif
-#ifndef NO_PTHREAD_BARRIER
"-A USEC --aligned=USEC align thread wakeups to a specific offset\n"
-#endif
"-b USEC --breaktrace=USEC send break trace command when latency > USEC\n"
"-B --preemptirqs both preempt and irqsoff tracing (used with -b)\n"
"-c CLOCK --clock=CLOCK select clock\n"
@@ -1092,9 +1088,7 @@ static void display_help(int error)
"-R --resolution check clock resolution, calling clock_gettime() many\n"
" times. list of clock_gettime() values will be\n"
" reported with -X\n"
-#ifndef NO_PTHREAD_BARRIER
" --secaligned [USEC] align thread wakeups to the next full second,\n"
-#endif
" and apply the optional offset\n"
"-s --system use sys_nanosleep and sys_setitimer\n"
"-S --smp Standard SMP testing: options -a -t -n and\n"
@@ -1244,10 +1238,7 @@ enum option_values {
OPT_PRIOSPREAD, OPT_RELATIVE, OPT_RESOLUTION, OPT_SYSTEM, OPT_SMP, OPT_THREADS,
OPT_TRACER, OPT_UNBUFFERED, OPT_NUMA, OPT_VERBOSE, OPT_WAKEUP, OPT_WAKEUPRT,
OPT_DBGCYCLIC, OPT_POLICY, OPT_HELP, OPT_NUMOPTS,
-#ifndef NO_PTHREAD_BARRIER
- OPT_ALIGNED, OPT_SECALIGNED,
-#endif
- OPT_LAPTOP,
+ OPT_ALIGNED, OPT_SECALIGNED, OPT_LAPTOP,
};
/* Process commandline options */
@@ -1265,9 +1256,7 @@ static void process_options (int argc, char *argv[], int max_cpus)
static struct option long_options[] = {
{"affinity", optional_argument, NULL, OPT_AFFINITY},
{"notrace", no_argument, NULL, OPT_NOTRACE },
-#ifndef NO_PTHREAD_BARRIER
{"aligned", optional_argument, NULL, OPT_ALIGNED },
-#endif
{"breaktrace", required_argument, NULL, OPT_BREAKTRACE },
{"preemptirqs", no_argument, NULL, OPT_PREEMPTIRQ },
{"clock", required_argument, NULL, OPT_CLOCK },
@@ -1297,9 +1286,7 @@ static void process_options (int argc, char *argv[], int max_cpus)
{"priospread", no_argument, NULL, OPT_PRIOSPREAD },
{"relative", no_argument, NULL, OPT_RELATIVE },
{"resolution", no_argument, NULL, OPT_RESOLUTION },
-#ifndef NO_PTHREAD_BARRIER
{"secaligned", optional_argument, NULL, OPT_SECALIGNED },
-#endif
{"system", no_argument, NULL, OPT_SYSTEM },
{"smp", no_argument, NULL, OPT_SMP },
{"threads", optional_argument, NULL, OPT_THREADS },
@@ -1334,7 +1321,6 @@ static void process_options (int argc, char *argv[], int max_cpus)
setaffinity = AFFINITY_USEALL;
}
break;
-#ifndef NO_PTHREAD_BARRIER
case 'A':
case OPT_ALIGNED:
aligned=1;
@@ -1345,7 +1331,6 @@ static void process_options (int argc, char *argv[], int max_cpus)
else
offset = 0;
break;
-#endif
case 'b':
case OPT_BREAKTRACE:
tracelimit = atoi(optarg); break;
@@ -1446,7 +1431,6 @@ static void process_options (int argc, char *argv[], int max_cpus)
case OPT_RESOLUTION:
check_clock_resolution = 1; break;
case 's':
-#ifndef NO_PTHREAD_BARRIER
case OPT_SECALIGNED:
secaligned = 1;
if (optarg != NULL)
@@ -1456,7 +1440,6 @@ static void process_options (int argc, char *argv[], int max_cpus)
else
offset = 0;
break;
-#endif
case OPT_SYSTEM:
use_system = MODE_SYS_OFFSET; break;
case 'S':
@@ -1593,7 +1576,6 @@ static void process_options (int argc, char *argv[], int max_cpus)
if (num_threads < 1)
error = 1;
-#ifndef NO_PTHREAD_BARRIER
if (aligned && secaligned)
error = 1;
@@ -1601,7 +1583,6 @@ static void process_options (int argc, char *argv[], int max_cpus)
pthread_barrier_init(&globalt_barr, NULL, num_threads);
pthread_barrier_init(&align_barr, NULL, num_threads);
}
-#endif
if (error) {
if (affinity_mask)
rt_bitmask_free(affinity_mask);
--
1.9.1
--
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