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author R. Belmont <rb6502@users.noreply.github.com>2013-01-01 16:11:32 +0000
committer R. Belmont <rb6502@users.noreply.github.com>2013-01-01 16:11:32 +0000
commitad80ff6c3f58529f95ca71d4ec397df6cb7eb25d (patch)
tree965b7d6f81b42ce36d685246ea1d067b88067111 /src/lib/portmidi/ptmacosx_mach.c
parente000eedfbbc6c8b5edd9f9e738e2ef12c9f326dc (diff)
portmidi: Initial commit. [R. Belmont]
(nw: this isn't enabled to compile yet, this is just to make it easier to run the final tests on my Mac and my Windows laptop)
Diffstat (limited to 'src/lib/portmidi/ptmacosx_mach.c')
-rw-r--r--src/lib/portmidi/ptmacosx_mach.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/src/lib/portmidi/ptmacosx_mach.c b/src/lib/portmidi/ptmacosx_mach.c
new file mode 100644
index 00000000000..d477e56e771
--- /dev/null
+++ b/src/lib/portmidi/ptmacosx_mach.c
@@ -0,0 +1,131 @@
+/* ptmacosx.c -- portable timer implementation for mac os x */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <CoreAudio/HostTime.h>
+
+#import <mach/mach.h>
+#import <mach/mach_error.h>
+#import <mach/mach_time.h>
+#import <mach/clock.h>
+#include <unistd.h>
+
+#include "porttime.h"
+#include "sys/time.h"
+#include "pthread.h"
+
+//#define NSEC_PER_MSEC 1000000
+#define THREAD_IMPORTANCE 30
+
+static int time_started_flag = FALSE;
+static UInt64 start_time;
+static pthread_t pt_thread_pid;
+
+/* note that this is static data -- we only need one copy */
+typedef struct {
+ int id;
+ int resolution;
+ PtCallback *callback;
+ void *userData;
+} pt_callback_parameters;
+
+static int pt_callback_proc_id = 0;
+
+static void *Pt_CallbackProc(void *p)
+{
+ pt_callback_parameters *parameters = (pt_callback_parameters *) p;
+ int mytime = 1;
+
+ kern_return_t error;
+ thread_extended_policy_data_t extendedPolicy;
+ thread_precedence_policy_data_t precedencePolicy;
+
+ extendedPolicy.timeshare = 0;
+ error = thread_policy_set(mach_thread_self(), THREAD_EXTENDED_POLICY,
+ (thread_policy_t)&extendedPolicy,
+ THREAD_EXTENDED_POLICY_COUNT);
+ if (error != KERN_SUCCESS) {
+ mach_error("Couldn't set thread timeshare policy", error);
+ }
+
+ precedencePolicy.importance = THREAD_IMPORTANCE;
+ error = thread_policy_set(mach_thread_self(), THREAD_PRECEDENCE_POLICY,
+ (thread_policy_t)&precedencePolicy,
+ THREAD_PRECEDENCE_POLICY_COUNT);
+ if (error != KERN_SUCCESS) {
+ mach_error("Couldn't set thread precedence policy", error);
+ }
+
+
+ /* to kill a process, just increment the pt_callback_proc_id */
+ /* printf("pt_callback_proc_id %d, id %d\n", pt_callback_proc_id, parameters->id); */
+ while (pt_callback_proc_id == parameters->id) {
+ /* wait for a multiple of resolution ms */
+ UInt64 wait_time;
+ int delay = mytime++ * parameters->resolution - Pt_Time();
+ PtTimestamp timestamp;
+ if (delay < 0) delay = 0;
+ wait_time = AudioConvertNanosToHostTime((UInt64)delay * NSEC_PER_MSEC);
+ wait_time += AudioGetCurrentHostTime();
+ error = mach_wait_until(wait_time);
+ timestamp = Pt_Time();
+ (*(parameters->callback))(timestamp, parameters->userData);
+ }
+ free(parameters);
+ return NULL;
+}
+
+
+PtError Pt_Start(int resolution, PtCallback *callback, void *userData)
+{
+ if (time_started_flag) return ptAlreadyStarted;
+ start_time = AudioGetCurrentHostTime();
+
+ if (callback) {
+ int res;
+ pt_callback_parameters *parms;
+
+ parms = (pt_callback_parameters *) malloc(sizeof(pt_callback_parameters));
+ if (!parms) return ptInsufficientMemory;
+ parms->id = pt_callback_proc_id;
+ parms->resolution = resolution;
+ parms->callback = callback;
+ parms->userData = userData;
+ res = pthread_create(&pt_thread_pid, NULL, Pt_CallbackProc, parms);
+ if (res != 0) return ptHostError;
+ }
+
+ time_started_flag = TRUE;
+ return ptNoError;
+}
+
+
+PtError Pt_Stop()
+{
+ /* printf("Pt_Stop called\n"); */
+ pt_callback_proc_id++;
+ pthread_join(pt_thread_pid, NULL);
+ time_started_flag = FALSE;
+ return ptNoError;
+}
+
+
+int Pt_Started()
+{
+ return time_started_flag;
+}
+
+
+PtTimestamp Pt_Time()
+{
+ UInt64 clock_time, nsec_time;
+ clock_time = AudioGetCurrentHostTime() - start_time;
+ nsec_time = AudioConvertHostTimeToNanos(clock_time);
+ return (PtTimestamp)(nsec_time / NSEC_PER_MSEC);
+}
+
+
+void Pt_Sleep(int32_t duration)
+{
+ usleep(duration * 1000);
+}