Use macos internal API for semaphore instead of bootstrap stuff

Signed-off-by: falkTX <[email protected]>
jackaudio · Mar 26, 2024 · d2a9dc5 · d2a9dc5
1 parent ac334fa
commit d2a9dc5
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Showing 5 changed files with 404 additions and 7 deletions.
diff --git a/common/wscript b/common/wscript
@@ -135,9 +135,8 @@ def build(bld):
             '../posix/JackPosixProcessSync.cpp',
             '../posix/JackPosixThread.cpp',
             '../posix/JackPosixMutex.cpp',
+            '../macosx/JackMachFutex.cpp',
             '../macosx/JackMachThread.mm',
-            '../macosx/JackMachSemaphore.mm',
-            '../macosx/JackMachSemaphoreServer.mm',
             '../posix/JackSocket.cpp',
             '../macosx/JackMachTime.c',
             ]

diff --git a/linux/JackLinuxFutex.cpp b/linux/JackLinuxFutex.cpp
@@ -165,6 +165,11 @@ bool JackLinuxFutex::Allocate(const char* name, const char* server_name, int val
 
     FutexData* futex = (FutexData*)mmap(NULL, sizeof(FutexData), PROT_READ|PROT_WRITE, MAP_SHARED|MAP_LOCKED, fSharedMem, 0);
 
+    // try without MAP_LOCKED
+    if (futex == NULL || futex == MAP_FAILED) {
+        futex = (FutexData*)mmap(NULL, sizeof(FutexData), PROT_READ|PROT_WRITE, MAP_SHARED, fSharedMem, 0);
+    }
+
     if (futex == NULL || futex == MAP_FAILED) {
         jack_error("Allocate: can't check in named futex name = %s err = %s", fName, strerror(errno));
         close(fSharedMem);
@@ -203,6 +208,11 @@ bool JackLinuxFutex::Connect(const char* name, const char* server_name)
 
     FutexData* futex = (FutexData*)mmap(NULL, sizeof(FutexData), PROT_READ|PROT_WRITE, MAP_SHARED|MAP_LOCKED, fSharedMem, 0);
 
+    // try without MAP_LOCKED
+    if (futex == NULL || futex == MAP_FAILED) {
+        futex = (FutexData*)mmap(NULL, sizeof(FutexData), PROT_READ|PROT_WRITE, MAP_SHARED, fSharedMem, 0);
+    }
+
     if (futex == NULL || futex == MAP_FAILED) {
         jack_error("Connect: can't connect named futex name = %s err = %s", fName, strerror(errno));
         close(fSharedMem);

diff --git a/macosx/JackMachFutex.cpp b/macosx/JackMachFutex.cpp
@@ -0,0 +1,306 @@
+/*
+Copyright (C) 2004-2008 Grame
+Copyright (C) 2016-2024 Filipe Coelho
+
+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.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+*/
+
+#include "JackMachFutex.h"
+#include "JackTools.h"
+#include "JackConstants.h"
+#include "JackError.h"
+#include "promiscuous.h"
+#include <cerrno>
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/mman.h>
+
+#define UL_COMPARE_AND_WAIT        1
+#define UL_COMPARE_AND_WAIT_SHARED 3
+#define ULF_WAKE_ALL               0x00000100
+#define ULF_NO_ERRNO               0x01000000
+
+extern "C" {
+int __ulock_wait(uint32_t operation, void* addr, uint64_t value, uint32_t timeout_us);
+int __ulock_wake(uint32_t operation, void* addr, uint64_t value);
+}
+
+namespace Jack
+{
+
+JackMachFutex::JackMachFutex() : JackSynchro(), fSharedMem(-1), fFutex(NULL), fPrivate(false)
+{
+    const char* promiscuous = getenv("JACK_PROMISCUOUS_SERVER");
+    fPromiscuous = (promiscuous != NULL);
+    fPromiscuousGid = jack_group2gid(promiscuous);
+}
+
+void JackMachFutex::BuildName(const char* client_name, const char* server_name, char* res, int size)
+{
+    char ext_client_name[SYNC_MAX_NAME_SIZE + 1];
+    JackTools::RewriteName(client_name, ext_client_name);
+
+    // make the name as small as possible, as macos has issues with long semaphore names
+    if (strcmp(server_name, "default") == 0)
+        server_name = "";
+    else if (strcmp(server_name, "mod-desktop") == 0)
+        server_name = "mdsk.";
+
+    if (fPromiscuous) {
+        snprintf(res, std::min(size, 32), "js.%s%s", server_name, ext_client_name);
+    } else {
+        snprintf(res, std::min(size, 32), "js%d.%s%s", JackTools::GetUID(), server_name, ext_client_name);
+    }
+}
+
+bool JackMachFutex::Signal()
+{
+    if (!fFutex) {
+        jack_error("JackMachFutex::Signal name = %s already deallocated!!", fName);
+        return false;
+    }
+
+    if (fFlush) {
+        return true;
+    }
+
+    if (! __sync_bool_compare_and_swap(&fFutex->futex, 0, 1))
+    {
+        // already unlocked, do not wake futex
+        if (! fFutex->internal) return true;
+    }
+
+    const uint32_t operation = ULF_NO_ERRNO | (fFutex->internal ? UL_COMPARE_AND_WAIT : UL_COMPARE_AND_WAIT_SHARED);
+    __ulock_wake(operation, fFutex, 0);
+    return true;
+}
+
+bool JackMachFutex::SignalAll()
+{
+    if (!fFutex) {
+        jack_error("JackMachFutex::SignalAll name = %s already deallocated!!", fName);
+        return false;
+    }
+
+    if (fFlush) {
+        return true;
+    }
+
+    const uint32_t operation = ULF_NO_ERRNO | ULF_WAKE_ALL | (fFutex->internal ? UL_COMPARE_AND_WAIT : UL_COMPARE_AND_WAIT_SHARED);
+    __ulock_wake(operation, fFutex, 0);
+    return true;
+}
+
+bool JackMachFutex::Wait()
+{
+    if (!fFutex) {
+        jack_error("JackMachFutex::Wait name = %s already deallocated!!", fName);
+        return false;
+    }
+
+    if (fFutex->needsChange)
+    {
+        fFutex->needsChange = false;
+        fFutex->internal = !fFutex->internal;
+    }
+
+    const uint32_t operation = fFutex->internal ? UL_COMPARE_AND_WAIT : UL_COMPARE_AND_WAIT_SHARED;
+
+    for (;;)
+    {
+        if (__sync_bool_compare_and_swap(&fFutex->futex, 1, 0))
+            return true;
+
+        if (__ulock_wait(operation, fFutex, 0, UINT32_MAX) != 0)
+            if (errno != EAGAIN && errno != EINTR)
+                return false;
+    }
+}
+
+bool JackMachFutex::TimedWait(long usec)
+{
+    if (usec == LONG_MAX)
+        return Wait();
+
+    if (!fFutex) {
+        jack_error("JackMachFutex::TimedWait name = %s already deallocated!!", fName);
+        return false;
+     }
+
+    if (fFutex->needsChange)
+    {
+        fFutex->needsChange = false;
+        fFutex->internal = !fFutex->internal;
+    }
+
+    const uint32_t operation = fFutex->internal ? UL_COMPARE_AND_WAIT : UL_COMPARE_AND_WAIT_SHARED;
+
+    for (;;)
+    {
+        if (__sync_bool_compare_and_swap(&fFutex->futex, 1, 0))
+            return true;
+
+        if (__ulock_wait(operation, fFutex, 0, usec) != 0)
+            if (errno != EAGAIN && errno != EINTR)
+                return false;
+    }
+}
+
+// Server side : publish the futex in the global namespace
+bool JackMachFutex::Allocate(const char* name, const char* server_name, int value, bool internal)
+{
+    BuildName(name, server_name, fName, sizeof(fName));
+    jack_log("JackMachFutex::Allocate name = %s val = %ld", fName, value);
+
+    // FIXME
+    shm_unlink(fName);
+
+    if ((fSharedMem = shm_open(fName, O_CREAT | O_RDWR, 0777)) < 0) {
+        jack_error("Allocate: can't check in named futex name = %s err = %s", fName, strerror(errno));
+        return false;
+    }
+
+    if (ftruncate(fSharedMem, sizeof(FutexData)) != 0) {
+        jack_error("Allocate: can't set shared memory size in named futex name = %s err = %s", fName, strerror(errno));
+        return false;
+    }
+
+    if (fPromiscuous && (jack_promiscuous_perms(fSharedMem, fName, fPromiscuousGid) < 0)) {
+        close(fSharedMem);
+        fSharedMem = -1;
+        shm_unlink(fName);
+        return false;
+    }
+
+    FutexData* futex = (FutexData*)mmap(NULL, sizeof(FutexData), PROT_READ|PROT_WRITE, MAP_SHARED, fSharedMem, 0);
+
+    if (futex == NULL || futex == MAP_FAILED) {
+        jack_error("Allocate: can't check in named futex name = %s err = %s", fName, strerror(errno));
+        close(fSharedMem);
+        fSharedMem = -1;
+        shm_unlink(fName);
+        return false;
+    }
+
+    mlock(futex, sizeof(FutexData));
+
+    fPrivate = internal;
+
+    futex->futex = value;
+    futex->internal = internal;
+    futex->wasInternal = internal;
+    futex->needsChange = false;
+    futex->externalCount = 0;
+    fFutex = futex;
+    return true;
+}
+
+// Client side : get the published futex from server
+bool JackMachFutex::Connect(const char* name, const char* server_name)
+{
+    BuildName(name, server_name, fName, sizeof(fName));
+    jack_log("JackMachFutex::Connect name = %s", fName);
+
+    // Temporary...
+    if (fFutex) {
+        jack_log("Already connected name = %s", name);
+        return true;
+    }
+
+    if ((fSharedMem = shm_open(fName, O_RDWR, 0)) < 0) {
+        jack_error("Connect: can't connect named futex name = %s err = %s", fName, strerror(errno));
+        return false;
+    }
+
+    FutexData* futex = (FutexData*)mmap(NULL, sizeof(FutexData), PROT_READ|PROT_WRITE, MAP_SHARED, fSharedMem, 0);
+
+    if (futex == NULL || futex == MAP_FAILED) {
+        jack_error("Connect: can't connect named futex name = %s err = %s", fName, strerror(errno));
+        close(fSharedMem);
+        fSharedMem = -1;
+        return false;
+    }
+
+    mlock(futex, sizeof(FutexData));
+
+    if (! fPrivate && futex->wasInternal)
+    {
+        const char* externalSync = getenv("JACK_INTERNAL_CLIENT_SYNC");
+
+        if (externalSync != NULL && strstr(fName, externalSync) != NULL && ++futex->externalCount == 1)
+        {
+            jack_error("Note: client %s running as external client temporarily", fName);
+            futex->needsChange = true;
+        }
+    }
+
+    fFutex = futex;
+    return true;
+}
+
+bool JackMachFutex::ConnectInput(const char* name, const char* server_name)
+{
+    return Connect(name, server_name);
+}
+
+bool JackMachFutex::ConnectOutput(const char* name, const char* server_name)
+{
+    return Connect(name, server_name);
+}
+
+bool JackMachFutex::Disconnect()
+{
+    if (!fFutex) {
+        return true;
+    }
+
+    if (! fPrivate && fFutex->wasInternal)
+    {
+        const char* externalSync = getenv("JACK_INTERNAL_CLIENT_SYNC");
+
+        if (externalSync != NULL && strstr(fName, externalSync) != NULL && --fFutex->externalCount == 0)
+        {
+            jack_error("Note: client %s now running as internal client again", fName);
+            fFutex->needsChange = true;
+        }
+    }
+
+    munmap(fFutex, sizeof(FutexData));
+    fFutex = NULL;
+
+    close(fSharedMem);
+    fSharedMem = -1;
+    return true;
+}
+
+// Server side : destroy the futex
+void JackMachFutex::Destroy()
+{
+    if (!fFutex) {
+        return;
+    }
+
+    munmap(fFutex, sizeof(FutexData));
+    fFutex = NULL;
+
+    close(fSharedMem);
+    fSharedMem = -1;
+
+    shm_unlink(fName);
+}
+
+} // end of namespace
+