[clr-ios] Enable CoreCLR tests for tvOS in extra-platforms (#122606)

## Description

This PR enables CoreCLR tests for tvOS in the extra-platforms pipelines.

Contributes to #120055

Author: kotlarmilos

eng/pipelines/extra-platforms/runtime-extra-platforms-ioslike.yml

@@ -179,8 +179,8 @@ jobs:
     isExtraPlatformsBuild: ${{ parameters.isExtraPlatformsBuild }}
     isiOSLikeOnlyBuild: ${{ parameters.isiOSLikeOnlyBuild }}
     platforms:
-      - ios_arm64
-      # - tvos_arm64 TODO: https://github.com/dotnet/runtime/issues/120055
+      # - ios_arm64 TODO: Enable when Helix queue upgrade is finished https://github.com/dotnet/runtime/issues/122452
+      - tvos_arm64
     variables:
       - ${{ if and(eq(variables['System.TeamProject'], 'public'), eq(variables['Build.Reason'], 'PullRequest')) }}:
         - name: _HelixSource
@@ -222,8 +222,8 @@ jobs:
     isExtraPlatformsBuild: ${{ parameters.isExtraPlatformsBuild }}
     isiOSLikeOnlyBuild: ${{ parameters.isiOSLikeOnlyBuild }}
     platforms:
-      - ios_arm64
-      # - tvos_arm64 TODO: https://github.com/dotnet/runtime/issues/120055
+      # - ios_arm64 TODO: Enable when Helix queue upgrade is finished https://github.com/dotnet/runtime/issues/122452
+      - tvos_arm64
     variables:
       # map dependencies variables to local variables
       - name: librariesContainsChange

eng/pipelines/extra-platforms/runtime-extra-platforms-ioslikesimulator.yml

@@ -148,7 +148,7 @@ jobs:
     platforms:
       - iossimulator_x64
       - iossimulator_arm64
-      # - tvossimulator_arm64 TODO: https://github.com/dotnet/runtime/issues/120055
+      - tvossimulator_arm64
     variables:
       - ${{ if and(eq(variables['System.TeamProject'], 'public'), eq(variables['Build.Reason'], 'PullRequest')) }}:
         - name: _HelixSource
@@ -192,7 +192,7 @@ jobs:
     platforms:
       - iossimulator_x64
       - iossimulator_arm64
-      # - tvossimulator_arm64 TODO: https://github.com/dotnet/runtime/issues/120055
+      - tvossimulator_arm64
     variables:
       # map dependencies variables to local variables
       - name: librariesContainsChange

src/coreclr/clrfeatures.cmake

@@ -86,7 +86,7 @@ if (CLR_CMAKE_TARGET_WIN32)
   set(FEATURE_TYPEEQUIVALENCE 1)
 endif(CLR_CMAKE_TARGET_WIN32)
 
-if (CLR_CMAKE_TARGET_MACCATALYST OR CLR_CMAKE_TARGET_IOS)
+if (CLR_CMAKE_TARGET_MACCATALYST OR CLR_CMAKE_TARGET_IOS OR CLR_CMAKE_TARGET_TVOS)
   set(FEATURE_STUBPRECODE_DYNAMIC_HELPERS 1)
 endif()
 

src/coreclr/pal/src/include/pal/threadsusp.hpp

@@ -48,9 +48,12 @@ Module Name:
 #include <semaphore.h>
 #endif // HAVE_SYS_SEMAPHORE_H
 
-#elif HAS_PTHREAD_MUTEXES && HAVE_MACH_EXCEPTIONS
+#elif HAS_PTHREAD_MUTEXES && (HAVE_MACH_EXCEPTIONS || defined(TARGET_TVOS))
 
 // Can only use the pthread solution if we're not using signals since pthread mutexes are not signal safe.
+
+// On tvOS, HAVE_MACH_EXCEPTIONS is 0 because thread_set_exception_ports is not available in the SDK.
+// However, System V IPC (semget) is also not available due to sandbox restrictions so we use pthread instead.
 #define USE_PTHREAD_CONDVARS 1
 
 #include <pthread.h>

src/coreclr/pal/src/thread/process.cpp

@@ -2475,7 +2475,7 @@ PROCCreateCrashDump(
         int bytesRead;
         while((bytesRead = read(child_read_pipe, &buffer, 1)) < 0 && errno == EINTR);
         close(child_read_pipe);
-        
+
         if (bytesRead != 1)
         {
             fprintf(stderr, "Problem reading from createdump child_read_pipe: %s (%d)\n", strerror(errno), errno);